Revert 86517 - Don't terminate plugin processes from the browser during...

Revert 86517 - Don't terminate plugin processes from the browser during browser shutdown. This is to allow the plugins to
shutdown gracefully, i.e. NP_Shutdown gets called. To ensure that we handle the case of a hung plugin, we handle
the OnChannelError notification in the IPC message filter implementation in the plugin process and post a delayed 
task to kill the process.

Fixes bug http://code.google.com/p/chromium/issues/detail?id=48178

BUG=48178
Review URL: http://codereview.chromium.org/6992006

TBR=ananta@chromium.org
Review URL: http://codereview.chromium.org/7065048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86532 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/browser_child_process_host.cc

@@ -109,11 +109,6 @@ void BrowserChildProcessHost::ForceShutdown() {
   ChildProcessHost::ForceShutdown();
 }
 
-void BrowserChildProcessHost::SetTerminateChildOnShutdown(
-  bool terminate_on_shutdown) {
-  child_process_->SetTerminateChildOnShutdown(terminate_on_shutdown);
-}
-
 void BrowserChildProcessHost::Notify(NotificationType type) {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE, new ChildNotificationTask(type, this));

content/browser/browser_child_process_host.h

@@ -92,10 +92,6 @@ class BrowserChildProcessHost : public ChildProcessHost,
   // the host list. Calls ChildProcessHost::ForceShutdown
   virtual void ForceShutdown();
 
-  // Controls whether the child process should be terminated on browser
-  // shutdown. Default is to always terminate.
-  void SetTerminateChildOnShutdown(bool terminate_on_shutdown);
-
  private:
   // By using an internal class as the ChildProcessLauncher::Client, we can
   // intercept OnProcessLaunched and do our own processing before

content/browser/child_process_launcher.cc

@@ -44,8 +44,7 @@ class ChildProcessLauncher::Context
   Context()
       : client_(NULL),
         client_thread_id_(BrowserThread::UI),
-        starting_(true),
-        terminate_child_on_shutdown_(true)
+        starting_(true)
 #if defined(OS_LINUX)
         , zygote_(false)
 #endif
@@ -88,10 +87,6 @@ class ChildProcessLauncher::Context
     client_ = NULL;
   }
 
-  void set_terminate_child_on_shutdown(bool terminate_on_shutdown) {
-    terminate_child_on_shutdown_ = terminate_on_shutdown;
-  }
-
  private:
   friend class base::RefCountedThreadSafe<ChildProcessLauncher::Context>;
   friend class ChildProcessLauncher;
@@ -215,9 +210,6 @@ class ChildProcessLauncher::Context
     if (!process_.handle())
       return;
 
-    if (!terminate_child_on_shutdown_)
-      return;
-
     // On Posix, EnsureProcessTerminated can lead to 2 seconds of sleep!  So
     // don't this on the UI/IO threads.
     BrowserThread::PostTask(
@@ -265,9 +257,6 @@ class ChildProcessLauncher::Context
   BrowserThread::ID client_thread_id_;
   base::Process process_;
   bool starting_;
-  // Controls whether the child process should be terminated on browser
-  // shutdown. Default behavior is to terminate the child.
-  bool terminate_child_on_shutdown_;
 
 #if defined(OS_LINUX)
   bool zygote_;
@@ -344,10 +333,3 @@ void ChildProcessLauncher::SetProcessBackgrounded(bool background) {
           &ChildProcessLauncher::Context::SetProcessBackgrounded,
           background));
 }
-
-void ChildProcessLauncher::SetTerminateChildOnShutdown(
-  bool terminate_on_shutdown) {
-  if (context_)
-    context_->set_terminate_child_on_shutdown(terminate_on_shutdown);
-}
-

content/browser/child_process_launcher.h

@@ -60,10 +60,6 @@ class ChildProcessLauncher {
   // this after the process has started.
   void SetProcessBackgrounded(bool background);
 
-  // Controls whether the child process should be terminated on browser
-  // shutdown.
-  void SetTerminateChildOnShutdown(bool terminate_on_shutdown);
-
  private:
   class Context;
 

content/browser/plugin_process_host.cc

@@ -221,12 +221,6 @@ bool PluginProcessHost::Init(const webkit::npapi::WebPluginInfo& info,
 #endif
       cmd_line);
 
-  // The plugin needs to be shutdown gracefully, i.e. NP_Shutdown needs to be
-  // called on the plugin. The plugin process exits when it receives the
-  // OnChannelError notification indicating that the browser plugin channel has
-  // been destroyed.
-  SetTerminateChildOnShutdown(false);
-
   content::GetContentClient()->browser()->PluginProcessHostCreated(this);
   AddFilter(new ResolveProxyMsgHelper(NULL));
 

content/plugin/plugin_channel.cc

@@ -32,19 +32,9 @@ class PluginReleaseTask : public Task {
   }
 };
 
-class PluginProcessExitTask : public Task {
- public:
-  void Run() {
-    base::KillProcess(base::GetCurrentProcessHandle(), 0, false);
-  }
-};
-
 // How long we wait before releasing the plugin process.
 const int kPluginReleaseTimeMs = 5 * 60 * 1000;  // 5 minutes
 
-// How long we wait before forcibly shutting down the process.
-const int kPluginProcessTerminateTimeoutMs = 3000;
-
 }  // namespace
 
 // If a sync call to the renderer results in a modal dialog, we need to have a
@@ -98,15 +88,6 @@ class PluginChannel::MessageFilter : public IPC::ChannelProxy::MessageFilter {
  private:
   void OnFilterAdded(IPC::Channel* channel) { channel_ = channel; }
 
-  virtual void OnChannelError() {
-    // Ensure that we don't wait indefinitely for the plugin to shutdown.
-    // as the browser does not terminate plugin processes on shutdown.
-    // We achieve this by posting an exit process task on the IO thread.
-    MessageLoop::current()->PostDelayedTask(FROM_HERE,
-                                            new PluginProcessExitTask(),
-                                            kPluginProcessTerminateTimeoutMs);
-  }
-
   bool OnMessageReceived(const IPC::Message& message) {
     IPC_BEGIN_MESSAGE_MAP(PluginChannel::MessageFilter, message)
       IPC_MESSAGE_HANDLER_DELAY_REPLY(PluginMsg_Init, OnInit)