Prune shared extendion module after extension updating.

chrome/browser/search/hotword_service.cc

 // Copyright 2013 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/search/hotword_service.h"
 
 #include "base/i18n/case_conversion.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
@@ skipping 267 matching lines @@
       extension_misc::kHotwordExtensionId,
       profile_,
       false,
       extensions::WebstoreStandaloneInstaller::Callback());
   installer_->BeginInstall();
 #endif
 }
 
 void HotwordService::OnExtensionInstalled(
     content::BrowserContext* browser_context,
-    const extensions::Extension* extension) {
+    const extensions::Extension* extension,
+    bool is_update) {
 
   if (extension->id() != extension_misc::kHotwordExtensionId ||
       profile_ != Profile::FromBrowserContext(browser_context))
     return;
 
   // If the previous locale pref has never been set, set it now since
   // the extension has been installed.
   if (!profile_->GetPrefs()->HasPrefPath(prefs::kHotwordPreviousLanguage))
     SetPreviousLanguagePref();
 
@@ skipping 200 matching lines @@
     return false;
 
   std::string previous_locale =
       profile_->GetPrefs()->GetString(prefs::kHotwordPreviousLanguage);
   std::string locale = GetCurrentLocale(profile_);
 
   // If it's a new locale, then the old extension should be uninstalled.
   return locale != previous_locale &&
       HotwordService::DoesHotwordSupportLanguage(profile_);
 }