Prune shared extendion module after extension updating.

chrome/browser/sync_file_system/sync_file_system_service.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync_file_system/sync_file_system_service.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/format_macros.h"
@@ skipping 601 matching lines @@
       SyncEventObserver, observers_,
       OnSyncStateUpdated(GURL(),
                          RemoteStateToSyncServiceState(state),
                          description));
 
   RunForEachSyncRunners(&SyncProcessRunner::Schedule);
 }
 
 void SyncFileSystemService::OnExtensionInstalled(
     content::BrowserContext* browser_context,
-    const Extension* extension) {
+    const Extension* extension,
+    bool is_update) {
   GURL app_origin = Extension::GetBaseURLFromExtensionId(extension->id());
   DVLOG(1) << "Handle extension notification for INSTALLED: " << app_origin;
   // NOTE: When an app is uninstalled and re-installed in a sequence,
   // |local_service_| may still keeps |app_origin| as disabled origin.
   local_service_->SetOriginEnabled(app_origin, true);
 }
 
 void SyncFileSystemService::OnExtensionUnloaded(
     content::BrowserContext* browser_context,
     const Extension* extension,
@@ skipping 115 matching lines @@
     v2_remote_service_->AddServiceObserver(v2_remote_syncer.get());
     v2_remote_service_->AddFileStatusObserver(this);
     v2_remote_service_->SetRemoteChangeProcessor(local_service_.get());
     v2_remote_service_->SetSyncEnabled(sync_enabled_);
     remote_sync_runners_.push_back(v2_remote_syncer.release());
   }
   return v2_remote_service_.get();
 }
 
 }  // namespace sync_file_system