Implemented 'Reset Search engines' feature.

chrome/browser/profile_resetter/profile_resetter.cc

 // Copyright (c) 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/profile_resetter/profile_resetter.h"
 
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/search_engines/template_url_prepopulate_data.h"
+#include "chrome/browser/search_engines/template_url_service.h"
+#include "chrome/browser/search_engines/template_url_service_factory.h"
 #include "content/public/browser/browser_thread.h"
 
 ProfileResetter::ProfileResetter(Profile* profile)
     : profile_(profile),
       pending_reset_flags_(0) {
   DCHECK(CalledOnValidThread());
+  DCHECK(profile_);
 }
 
 ProfileResetter::~ProfileResetter() {}
 
 void ProfileResetter::Reset(ProfileResetter::ResettableFlags resettable_flags,
                             ExtensionHandling extension_handling,
                             const base::Closure& callback) {
   DCHECK(CalledOnValidThread());
 
   // We should never be called with unknown flags.
@@ skipping 39 matching lines @@
 
 void ProfileResetter::MarkAsDone(Resettable resettable) {
   DCHECK(CalledOnValidThread());
 
   // Check that we are never called twice or unexpectedly.
   CHECK(pending_reset_flags_ & resettable);
 
   pending_reset_flags_ &= ~resettable;
 
   if (!pending_reset_flags_)
-    callback_.Run();
+    content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
+                                     callback_);
 }
 
 void ProfileResetter::ResetDefaultSearchEngine() {
   DCHECK(CalledOnValidThread());
-  NOTIMPLEMENTED();
-  // TODO(battre/vabr): Implement
+
+  TemplateURLPrepopulateData::ClearPrepopulatedEnginesInPrefs(profile_);
+  TemplateURLService* template_url_service =
+      TemplateURLServiceFactory::GetForProfile(profile_);
+  DCHECK(template_url_service);
+  template_url_service->ClearDefaultProviderFromPrefs();
+  template_url_service->ResetNonExtensionURLs();
+
   MarkAsDone(DEFAULT_SEARCH_ENGINE);
 }
 
 void ProfileResetter::ResetHomepage() {
   DCHECK(CalledOnValidThread());
   NOTIMPLEMENTED();
   // TODO(battre/vabr): Implement
   MarkAsDone(HOMEPAGE);
 }
 
@@ skipping 10 matching lines @@
   // TODO(battre/vabr): Implement
   MarkAsDone(COOKIES_AND_SITE_DATA);
 }
 
 void ProfileResetter::ResetExtensions(ExtensionHandling extension_handling) {
   DCHECK(CalledOnValidThread());
   NOTIMPLEMENTED();
   // TODO(battre/vabr): Implement
   MarkAsDone(EXTENSIONS);
 }