Add base::RunLoop and update ui_test_utils to use it to reduce flakiness

chrome/browser/autocomplete/search_provider_unittest.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/autocomplete/search_provider.h"
 
+#include "base/run_loop.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "chrome/browser/autocomplete/autocomplete.h"
 #include "chrome/browser/autocomplete/autocomplete_classifier_factory.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/prefs/pref_service.h"
@@ skipping 152 matching lines @@
     quit_when_done_ = false;
     message_loop_.Quit();
   }
 }
 
 void SearchProviderTest::RunTillProviderDone() {
   if (provider_->done())
     return;
 
   quit_when_done_ = true;
-#if defined(OS_MACOSX)
-  message_loop_.Run();
-#elif defined(OS_ANDROID)
+#if defined(OS_ANDROID)
   // Android doesn't have Run(), only Start().
   message_loop_.Start();
 #else
-  message_loop_.RunWithDispatcher(NULL);
+  base::RunLoop run_loop;
+  run_loop.Run();
 #endif
 }
 
 void SearchProviderTest::QueryForInput(const string16& text,
                                        const string16& desired_tld,
                                        bool prevent_inline_autocomplete) {
   // Start a query.
   AutocompleteInput input(text, desired_tld, prevent_inline_autocomplete,
                           false, true, AutocompleteInput::ALL_MATCHES);
   provider_->Start(input, false);
@@ skipping 1031 matching lines @@
   EXPECT_EQ(AutocompleteMatch::ACMatchClassification::URL,
             match.contents_class[0].style);
   EXPECT_EQ(4U, match.contents_class[1].offset);
   EXPECT_EQ(AutocompleteMatch::ACMatchClassification::URL |
             AutocompleteMatch::ACMatchClassification::MATCH,
             match.contents_class[1].style);
   EXPECT_EQ(5U, match.contents_class[2].offset);
   EXPECT_EQ(AutocompleteMatch::ACMatchClassification::URL,
             match.contents_class[2].style);
 }