Use content::RunBlockingPoolTask() in tests.

ash/desktop_background/desktop_background_controller_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 "ash/desktop_background/desktop_background_controller.h"
 
 #include <cmath>
 #include <cstdlib>
 
 #include "ash/ash_switches.h"
@@ skipping 273 matching lines @@
   test::DisplayManagerTestApi display_manager_test_api(
       Shell::GetInstance()->display_manager());
   display_manager_test_api.UpdateDisplay("320x200");
 
   gfx::ImageSkia image = CreateImage(640, 480, kCustomWallpaperColor);
 
   // Set the image as custom wallpaper, wait for the resize to finish, and check
   // that the resized image is the expected size.
   controller_->SetWallpaperImage(image, WALLPAPER_LAYOUT_STRETCH);
   EXPECT_TRUE(image.BackedBySameObjectAs(controller_->GetWallpaper()));
-  content::BrowserThread::GetBlockingPool()->FlushForTesting();
-  content::RunAllPendingInMessageLoop();
+  content::RunAllBlockingPoolTasksUntilIdle();
   gfx::ImageSkia resized_image = controller_->GetWallpaper();
   EXPECT_FALSE(image.BackedBySameObjectAs(resized_image));
   EXPECT_EQ(gfx::Size(320, 200).ToString(), resized_image.size().ToString());
 
   // Load the original wallpaper again and check that we're still using the
   // previously-resized image instead of doing another resize
   // (http://crbug.com/321402).
   controller_->SetWallpaperImage(image, WALLPAPER_LAYOUT_STRETCH);
-  content::BrowserThread::GetBlockingPool()->FlushForTesting();
-  content::RunAllPendingInMessageLoop();
+  content::RunAllBlockingPoolTasksUntilIdle();
   EXPECT_TRUE(resized_image.BackedBySameObjectAs(controller_->GetWallpaper()));
 }
 
 TEST_F(DesktopBackgroundControllerTest, GetMaxDisplaySize) {
   // Device scale factor shouldn't affect the native size.
   UpdateDisplay("1000x300*2");
   EXPECT_EQ(
       "1000x300",
       DesktopBackgroundController::GetMaxDisplaySizeInNative().ToString());
 
@@ skipping 26 matching lines @@
 
   // Maximum width and height belongs to different displays.
   UpdateDisplay("400x300,100x500");
   EXPECT_EQ(
       "400x500",
       DesktopBackgroundController::GetMaxDisplaySizeInNative().ToString());
 }
 
 
 }  // namespace ash