Prune shared extendion module after extension updating.

chrome/browser/apps/drive/drive_app_provider.cc

 // Copyright 2014 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/apps/drive/drive_app_provider.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 203 matching lines @@
   }
 
   for (size_t i = 0; i < drive_apps_.size(); ++i) {
     AddOrUpdateDriveApp(drive_apps_[i]);
   }
   SchedulePendingConverters();
 }
 
 void DriveAppProvider::OnExtensionInstalled(
     content::BrowserContext* browser_context,
-    const Extension* extension) {
+    const Extension* extension,
+    bool is_update) {
   // Bail if the |extension| is installed from a converter. The post install
   // processing will be handled in OnLocalAppConverted.
   if (!pending_converters_.empty() &&
       pending_converters_.front()->IsInstalling(extension->id())) {
     return;
   }
 
   // Only user installed app reaches here. If it is mapped, make sure it is not
   // tagged as generated.
   const std::string drive_app_id = mapping_->GetDriveApp(extension->id());
@@ skipping 22 matching lines @@
 void DriveAppProvider::OnExtensionUninstalled(
     content::BrowserContext* browser_context,
     const Extension* extension) {
   std::string drive_app_id = mapping_->GetDriveApp(extension->id());
   if (drive_app_id.empty())
     return;
 
   service_bridge_->GetAppRegistry()->UninstallApp(
       drive_app_id, base::Bind(&IgnoreUninstallResult));
 }