AppCache: Delete non-PlzNavigate dead code.

Bug: 789577
Change-Id: I10cbc8ad7e7c1052ccabfcc9bc9328367a537faa
Reviewed-on: https://chromium-review.googlesource.com/1118077Reviewed-by: Joshua Bell <jsbell@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571306}

content/browser/appcache/appcache_backend_impl.cc

@@ -126,39 +126,8 @@ void AppCacheBackendImpl::GetResourceList(
   host->GetResourceList(resource_infos);
 }
 
-std::unique_ptr<AppCacheHost> AppCacheBackendImpl::TransferHostOut(
-    int host_id) {
-  auto found = hosts_.find(host_id);
-  if (found == hosts_.end()) {
-    NOTREACHED();
-    return std::unique_ptr<AppCacheHost>();
-  }
-
-  std::unique_ptr<AppCacheHost> transferree = std::move(found->second);
-
-  // Put a new empty host in its place.
-  found->second = std::make_unique<AppCacheHost>(host_id, frontend_, service_);
-
-  // We give up ownership.
-  transferree->PrepareForTransfer();
-  return transferree;
-}
-
-void AppCacheBackendImpl::TransferHostIn(int new_host_id,
-                                         std::unique_ptr<AppCacheHost> host) {
-  auto found = hosts_.find(new_host_id);
-  if (found == hosts_.end()) {
-    NOTREACHED();
-    return;
-  }
-
-  host->CompleteTransfer(new_host_id, frontend_);
-  found->second = std::move(host);
-}
-
 void AppCacheBackendImpl::RegisterPrecreatedHost(
     std::unique_ptr<AppCacheHost> host) {
-  DCHECK(IsBrowserSideNavigationEnabled());
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   DCHECK(host.get());

content/browser/appcache/appcache_backend_impl.h

@@ -59,13 +59,6 @@ class CONTENT_EXPORT AppCacheBackendImpl {
   using HostMap = base::hash_map<int, std::unique_ptr<AppCacheHost>>;
   const HostMap& hosts() { return hosts_; }
 
-  // Methods to support cross site navigations. Hosts are transferred
-  // from process to process accordingly, deparented from the old
-  // processes backend and reparented to the new.
-  std::unique_ptr<AppCacheHost> TransferHostOut(int host_id);
-  void TransferHostIn(int new_host_id, std::unique_ptr<AppCacheHost> host);
-
-  // PlzNavigate
   // The AppCacheHost is precreated by the AppCacheNavigationHandleCore class
   // when a navigation is initiated. We register the host with the backend in
   // this function and ignore registrations for this host id from the renderer.

content/browser/appcache/appcache_dispatcher_host.cc

@@ -39,17 +39,15 @@ void AppCacheDispatcherHost::Create(ChromeAppCacheService* appcache_service,
 
 void AppCacheDispatcherHost::RegisterHost(int32_t host_id) {
   if (appcache_service_) {
-    // PlzNavigate
     // The AppCacheHost could have been precreated in which case we want to
     // register it with the backend here.
-    if (IsBrowserSideNavigationEnabled()) {
-      std::unique_ptr<content::AppCacheHost> host =
-          AppCacheNavigationHandleCore::GetPrecreatedHost(host_id);
-      if (host.get()) {
-        backend_impl_.RegisterPrecreatedHost(std::move(host));
-        return;
-      }
+    std::unique_ptr<content::AppCacheHost> host =
+        AppCacheNavigationHandleCore::GetPrecreatedHost(host_id);
+    if (host.get()) {
+      backend_impl_.RegisterPrecreatedHost(std::move(host));
+      return;
     }
+
     if (!backend_impl_.RegisterHost(host_id)) {
       mojo::ReportBadMessage("ACDH_REGISTER");
     }

content/browser/appcache/appcache_host.cc

@@ -509,20 +509,6 @@ void AppCacheHost::NotifyMainResourceBlocked(const GURL& manifest_url) {
   blocked_manifest_url_ = manifest_url;
 }
 
-void AppCacheHost::PrepareForTransfer() {
-  // This can only happen prior to the document having been loaded.
-  DCHECK(!associated_cache());
-  DCHECK(!is_selection_pending());
-  DCHECK(!group_being_updated_.get());
-  host_id_ = kAppCacheNoHostId;
-  frontend_ = nullptr;
-}
-
-void AppCacheHost::CompleteTransfer(int host_id, AppCacheFrontend* frontend) {
-  host_id_ = host_id;
-  frontend_ = frontend;
-}
-
 base::WeakPtr<AppCacheHost> AppCacheHost::GetWeakPtr() {
   return weak_factory_.GetWeakPtr();
 }

content/browser/appcache/appcache_host.h

@@ -191,10 +191,6 @@ class CONTENT_EXPORT AppCacheHost
 
   const GURL& first_party_url() const { return first_party_url_; }
 
-  // Methods to support cross site navigations.
-  void PrepareForTransfer();
-  void CompleteTransfer(int host_id, AppCacheFrontend* frontend);
-
   // Returns a weak pointer reference to the host.
   base::WeakPtr<AppCacheHost> GetWeakPtr();