Use ScopedTaskEnvironment instead of MessageLoop in RenderViewTest.

chrome/renderer/content_settings_observer_browsertest.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 <stddef.h>
 
+#include "base/run_loop.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/renderer/content_settings_observer.h"
 #include "chrome/test/base/chrome_render_view_test.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "content/public/renderer/render_view.h"
 #include "ipc/ipc_message_macros.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/web/WebFrameContentDumper.h"
 #include "third_party/WebKit/public/web/WebView.h"
@@ skipping 90 matching lines @@
       ContentSettingPatternSource(ContentSettingsPattern::Wildcard(),
                                   ContentSettingsPattern::Wildcard(),
                                   CONTENT_SETTING_BLOCK,
                                   std::string(),
                                   false));
   ContentSettingsObserver* observer = ContentSettingsObserver::Get(
       view_->GetMainRenderFrame());
   observer->SetContentSettingRules(&content_setting_rules);
 
   // Make sure no pending messages are in the queue.
-  ProcessPendingMessages();
+  base::RunLoop().RunUntilIdle();
   render_thread_->sink().ClearMessages();
 
   // 3. Reload page.
   std::string url_str = "data:text/html;charset=utf-8,";
   url_str.append(kHtml);
   GURL url(url_str);
   Reload(url);
-  ProcessPendingMessages();
+  base::RunLoop().RunUntilIdle();
 
   // 4. Verify that the notification that javascript was blocked is sent after
   //    the navigation notification is sent.
   int navigation_index = -1;
   int block_index = -1;
   for (size_t i = 0; i < render_thread_->sink().message_count(); ++i) {
     const IPC::Message* msg = render_thread_->sink().GetMessageAt(i);
     if (msg->type() == GetNavigationIPCType())
       navigation_index = i;
     if (msg->type() == ChromeViewHostMsg_ContentBlocked::ID)
@@ skipping 380 matching lines @@
       ContentSettingPatternSource(
           ContentSettingsPattern::Wildcard(),
           ContentSettingsPattern::Wildcard(),
           CONTENT_SETTING_BLOCK,
           std::string(),
           false));
 
   EXPECT_FALSE(observer->AllowAutoplay(true));
   ::testing::Mock::VerifyAndClearExpectations(&observer);
 }