Implemented 'Reset Search engines' feature.

chrome/browser/profile_resetter/profile_resetter.cc

Index: chrome/browser/profile_resetter/profile_resetter.cc
diff --git a/chrome/browser/profile_resetter/profile_resetter.cc b/chrome/browser/profile_resetter/profile_resetter.cc
index 2528754e54cd862b11263556b1dcaddd7be86fc1..1696b537f76faa9b7d459a2b835c159a74fb2112 100644
--- a/chrome/browser/profile_resetter/profile_resetter.cc
+++ b/chrome/browser/profile_resetter/profile_resetter.cc
@@ -5,12 +5,16 @@
 #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() {}
@@ -70,13 +74,20 @@ void ProfileResetter::MarkAsDone(Resettable 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);
 }