Remove deprecated extension notification from ProcessManager.

This patch used EntensionRegistryObserver instead of DEPRECATED extension
NOTIFICATION_EXTENSION_UNLOADED_DEPRECATED removed now.

BUG=411568

Review URL: https://codereview.chromium.org/566863002

Cr-Commit-Position: refs/heads/master@{#294799}

extensions/browser/process_manager.cc

@@ -247,15 +247,10 @@ ProcessManager::ProcessManager(BrowserContext* context,
       weak_ptr_factory_(this) {
   // ExtensionRegistry is shared between incognito and regular contexts.
   DCHECK_EQ(original_context, extension_registry_->browser_context());
+  extension_registry_->AddObserver(this);
   registrar_.Add(this,
                  extensions::NOTIFICATION_EXTENSIONS_READY_DEPRECATED,
                  content::Source<BrowserContext>(original_context));
-  registrar_.Add(this,
-                 extensions::NOTIFICATION_EXTENSION_LOADED_DEPRECATED,
-                 content::Source<BrowserContext>(original_context));
-  registrar_.Add(this,
-                 extensions::NOTIFICATION_EXTENSION_UNLOADED_DEPRECATED,
-                 content::Source<BrowserContext>(original_context));
   registrar_.Add(this,
                  extensions::NOTIFICATION_EXTENSION_HOST_DESTROYED,
                  content::Source<BrowserContext>(context));
@@ -291,6 +286,7 @@ ProcessManager::ProcessManager(BrowserContext* context,
 }
 
 ProcessManager::~ProcessManager() {
+  extension_registry_->RemoveObserver(this);
   CloseBackgroundHosts();
   DCHECK(background_hosts_.empty());
   content::DevToolsAgentHost::RemoveAgentStateCallback(devtools_callback_);
@@ -688,33 +684,6 @@ void ProcessManager::Observe(int type,
       break;
     }
 
-    case extensions::NOTIFICATION_EXTENSION_LOADED_DEPRECATED: {
-      BrowserContext* context = content::Source<BrowserContext>(source).ptr();
-      ExtensionSystem* system = ExtensionSystem::Get(context);
-      if (system->ready().is_signaled()) {
-        // The extension system is ready, so create the background host.
-        const Extension* extension =
-            content::Details<const Extension>(details).ptr();
-        CreateBackgroundHostForExtensionLoad(this, extension);
-      }
-      break;
-    }
-
-    case extensions::NOTIFICATION_EXTENSION_UNLOADED_DEPRECATED: {
-      const Extension* extension =
-          content::Details<UnloadedExtensionInfo>(details)->extension;
-      for (ExtensionHostSet::iterator iter = background_hosts_.begin();
-           iter != background_hosts_.end(); ++iter) {
-        ExtensionHost* host = *iter;
-        if (host->extension_id() == extension->id()) {
-          CloseBackgroundHost(host);
-          break;
-        }
-      }
-      UnregisterExtension(extension->id());
-      break;
-    }
-
     case extensions::NOTIFICATION_EXTENSION_HOST_DESTROYED: {
       ExtensionHost* host = content::Details<ExtensionHost>(details).ptr();
       if (background_hosts_.erase(host)) {
@@ -780,6 +749,31 @@ void ProcessManager::Observe(int type,
   }
 }
 
+void ProcessManager::OnExtensionLoaded(content::BrowserContext* browser_context,
+                                       const extensions::Extension* extension) {
+  ExtensionSystem* system = ExtensionSystem::Get(browser_context);
+  if (system->ready().is_signaled()) {
+    // The extension system is ready, so create the background host.
+    CreateBackgroundHostForExtensionLoad(this, extension);
+  }
+}
+
+void ProcessManager::OnExtensionUnloaded(
+    content::BrowserContext* browser_context,
+    const extensions::Extension* extension,
+    extensions::UnloadedExtensionInfo::Reason reason) {
+  for (ExtensionHostSet::iterator iter = background_hosts_.begin();
+       iter != background_hosts_.end();
+       ++iter) {
+    ExtensionHost* host = *iter;
+    if (host->extension_id() == extension->id()) {
+      CloseBackgroundHost(host);
+      break;
+    }
+  }
+  UnregisterExtension(extension->id());
+}
+
 void ProcessManager::OnDevToolsStateChanged(
     content::DevToolsAgentHost* agent_host,
     bool attached) {

extensions/browser/process_manager.h

@@ -17,6 +17,7 @@
 #include "base/time/time.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
+#include "extensions/browser/extension_registry_observer.h"
 #include "extensions/common/view_type.h"
 
 class GURL;
@@ -40,7 +41,8 @@ class ProcessManagerObserver;
 // Manages dynamic state of running Chromium extensions. There is one instance
 // of this class per Profile. OTR Profiles have a separate instance that keeps
 // track of split-mode extensions only.
-class ProcessManager : public content::NotificationObserver {
+class ProcessManager : public content::NotificationObserver,
+                       public extensions::ExtensionRegistryObserver {
  public:
   typedef std::set<extensions::ExtensionHost*> ExtensionHostSet;
   typedef ExtensionHostSet::const_iterator const_iterator;
@@ -178,6 +180,16 @@ class ProcessManager : public content::NotificationObserver {
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
+  // extensions::ExtensionRegistryObserver:
+  virtual void OnExtensionLoaded(
+      content::BrowserContext* browser_context,
+      const extensions::Extension* extension) OVERRIDE;
+
+  virtual void OnExtensionUnloaded(
+      content::BrowserContext* browser_context,
+      const extensions::Extension* extension,
+      extensions::UnloadedExtensionInfo::Reason reason) OVERRIDE;
+
   content::NotificationRegistrar registrar_;
 
   // The set of ExtensionHosts running viewless background extensions.

extensions/browser/process_manager_unittest.cc

@@ -110,13 +110,6 @@ TEST_F(ProcessManagerTest, ExtensionNotificationRegistration) {
   EXPECT_TRUE(IsRegistered(manager1.get(),
                            extensions::NOTIFICATION_EXTENSIONS_READY_DEPRECATED,
                            original_context()));
-  EXPECT_TRUE(IsRegistered(manager1.get(),
-                           extensions::NOTIFICATION_EXTENSION_LOADED_DEPRECATED,
-                           original_context()));
-  EXPECT_TRUE(
-      IsRegistered(manager1.get(),
-                   extensions::NOTIFICATION_EXTENSION_UNLOADED_DEPRECATED,
-                   original_context()));
   EXPECT_TRUE(IsRegistered(manager1.get(),
                            extensions::NOTIFICATION_EXTENSION_HOST_DESTROYED,
                            original_context()));
@@ -131,11 +124,6 @@ TEST_F(ProcessManagerTest, ExtensionNotificationRegistration) {
   EXPECT_EQ(incognito_context(), manager2->GetBrowserContext());
   EXPECT_EQ(0u, manager2->background_hosts().size());
 
-  // Some notifications are observed for the original context.
-  EXPECT_TRUE(IsRegistered(manager2.get(),
-                           extensions::NOTIFICATION_EXTENSION_LOADED_DEPRECATED,
-                           original_context()));
-
   // Some notifications are observed for the incognito context.
   EXPECT_TRUE(IsRegistered(manager2.get(),
                            extensions::NOTIFICATION_EXTENSION_HOST_DESTROYED,