Use ScopedTaskEnvironment instead of MessageLoop in RenderViewTest.

content/renderer/render_view_browsertest_mac.mm

 // 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 "base/run_loop.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/common/frame_messages.h"
 #include "content/common/frame_replication_state.h"
 #include "content/common/input_messages.h"
 #include "content/common/text_input_client_messages.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/common/web_preferences.h"
 #include "content/public/test/render_view_test.h"
@@ skipping 89 matching lines @@
 
   // First test when javascript does not eat keypresses -- should scroll.
   view->set_send_content_state_immediately(true);
   LoadHTML(kRawHtml);
   render_thread_->sink().ClearMessages();
 
   const char* kArrowDownScrollDown = "40,false,false,true,false\n10144\np1";
   view->OnSetEditCommandsForNextKeyEvent(
       EditCommands(1, EditCommand("moveToEndOfDocument", "")));
   SendNativeKeyEvent(NativeWebKeyboardEvent(arrowDownKeyDown));
-  ProcessPendingMessages();
+  base::RunLoop().RunUntilIdle();
   ExecuteJavaScriptForTests("scroll.textContent = window.pageYOffset");
   output = WebFrameContentDumper::DumpWebViewAsText(view->GetWebView(),
                                                     kMaxOutputCharacters)
                .Ascii();
   EXPECT_EQ(kArrowDownScrollDown, output);
 
   const char* kArrowUpScrollUp = "38,false,false,true,false\n0\np1";
   view->OnSetEditCommandsForNextKeyEvent(
       EditCommands(1, EditCommand("moveToBeginningOfDocument", "")));
   SendNativeKeyEvent(NativeWebKeyboardEvent(arrowUpKeyDown));
-  ProcessPendingMessages();
+  base::RunLoop().RunUntilIdle();
   ExecuteJavaScriptForTests("scroll.textContent = window.pageYOffset");
   output = WebFrameContentDumper::DumpWebViewAsText(view->GetWebView(),
                                                     kMaxOutputCharacters)
                .Ascii();
   EXPECT_EQ(kArrowUpScrollUp, output);
 
   // Now let javascript eat the key events -- no scrolling should happen.
   // Set a scroll position slightly down the page to ensure that it does not
   // move.
   ExecuteJavaScriptForTests("allowKeyEvents = false; window.scrollTo(0, 100)");
 
   const char* kArrowDownNoScroll = "40,false,false,true,false\n100\np1";
   view->OnSetEditCommandsForNextKeyEvent(
       EditCommands(1, EditCommand("moveToEndOfDocument", "")));
   SendNativeKeyEvent(NativeWebKeyboardEvent(arrowDownKeyDown));
-  ProcessPendingMessages();
+  base::RunLoop().RunUntilIdle();
   ExecuteJavaScriptForTests("scroll.textContent = window.pageYOffset");
   output = WebFrameContentDumper::DumpWebViewAsText(view->GetWebView(),
                                                     kMaxOutputCharacters)
                .Ascii();
   EXPECT_EQ(kArrowDownNoScroll, output);
 
   const char* kArrowUpNoScroll = "38,false,false,true,false\n100\np1";
   view->OnSetEditCommandsForNextKeyEvent(
       EditCommands(1, EditCommand("moveToBeginningOfDocument", "")));
   SendNativeKeyEvent(NativeWebKeyboardEvent(arrowUpKeyDown));
-  ProcessPendingMessages();
+  base::RunLoop().RunUntilIdle();
   ExecuteJavaScriptForTests("scroll.textContent = window.pageYOffset");
   output = WebFrameContentDumper::DumpWebViewAsText(view->GetWebView(),
                                                     kMaxOutputCharacters)
                .Ascii();
   EXPECT_EQ(kArrowUpNoScroll, output);
 }
 
 // TODO(ekaramad): This test could be removed once we do not send irrelevant
 // IPCs from browser during the time RenderViewImpl is swapped out
 // (https://crbug.com/669219).
@@ skipping 32 matching lines @@
   using Text = base::string16;
   using Underlines = std::vector<blink::WebCompositionUnderline>;
   view->OnMessageReceived(InputMsg_ImeSetComposition(
       routing_id, Text(), Underlines(), Range(), 0, 0));
   view->OnMessageReceived(
       InputMsg_ImeCommitText(routing_id, Text(), Underlines(), Range(), 0));
   view->OnMessageReceived(InputMsg_ImeFinishComposingText(routing_id, false));
 }
 
 }  // namespace content