Remove the GoogleURLTracker infobar functionality entirely.

chrome/browser/google/google_url_tracker_factory.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/google/google_url_tracker_factory.h"
 
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/google/chrome_google_url_tracker_client.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/google/core/browser/google_pref_names.h"
 #include "components/google/core/browser/google_url_tracker.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 
+namespace {
+
+const char kLastPromptedGoogleURL[] = "browser.last_prompted_google_url";
+
+}  // namespace
+
 
 // static
 GoogleURLTracker* GoogleURLTrackerFactory::GetForProfile(Profile* profile) {
   return static_cast<GoogleURLTracker*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 GoogleURLTrackerFactory* GoogleURLTrackerFactory::GetInstance() {
   return Singleton<GoogleURLTrackerFactory>::get();
 }
 
 GoogleURLTrackerFactory::GoogleURLTrackerFactory()
     : BrowserContextKeyedServiceFactory(
         "GoogleURLTracker",
         BrowserContextDependencyManager::GetInstance()) {
 }
 
 GoogleURLTrackerFactory::~GoogleURLTrackerFactory() {
 }
 
 KeyedService* GoogleURLTrackerFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
+  // Delete this now-unused pref.
+  // At some point in the future, this code can be removed entirely.
+  static_cast<Profile*>(context)->GetOriginalProfile()->GetPrefs()->ClearPref(
+      kLastPromptedGoogleURL);
+
   scoped_ptr<GoogleURLTrackerClient> client(
       new ChromeGoogleURLTrackerClient(Profile::FromBrowserContext(context)));
   return new GoogleURLTracker(client.Pass(), GoogleURLTracker::NORMAL_MODE);
 }
 
 void GoogleURLTrackerFactory::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* user_prefs) {
   user_prefs->RegisterStringPref(
       prefs::kLastKnownGoogleURL,
       GoogleURLTracker::kDefaultGoogleHomepage,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   user_prefs->RegisterStringPref(
-      prefs::kLastPromptedGoogleURL,
+      kLastPromptedGoogleURL,
       std::string(),
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 content::BrowserContext* GoogleURLTrackerFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }
 
 bool GoogleURLTrackerFactory::ServiceIsCreatedWithBrowserContext() const {
   return true;
 }
 
 bool GoogleURLTrackerFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }