Use ScopedTaskEnvironment instead of MessageLoop in RenderViewTest.

chrome/renderer/content_settings_observer_browsertest.cc

Index: chrome/renderer/content_settings_observer_browsertest.cc
diff --git a/chrome/renderer/content_settings_observer_browsertest.cc b/chrome/renderer/content_settings_observer_browsertest.cc
index daa026988567e768309eaee6ee8fc8a652aac6e1..21cd6288cdf786c6cf9db8b81bcdc65d928fd0ba 100644
--- a/chrome/renderer/content_settings_observer_browsertest.cc
+++ b/chrome/renderer/content_settings_observer_browsertest.cc
@@ -4,6 +4,7 @@
 
 #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"
@@ -114,7 +115,7 @@ TEST_F(ChromeRenderViewTest, JSBlockSentAfterPageLoad) {
   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.
@@ -122,7 +123,7 @@ TEST_F(ChromeRenderViewTest, JSBlockSentAfterPageLoad) {
   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.