Fix a few spelling errors in comments.

chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager_browsertest.cc

 // Copyright 2014 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/chromeos/login/users/wallpaper/wallpaper_manager.h"
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/desktop_background/desktop_background_controller_observer.h"
 #include "ash/desktop_background/desktop_background_controller_test_api.h"
 #include "ash/display/display_manager.h"
@@ skipping 679 matching lines @@
             WallpaperManager::Get()->GetAppropriateResolution());
   EXPECT_EQ(1, observer.GetUpdateWallpaperCountAndReset());
   UpdateDisplay("1366x800/r");
   // Wait for asynchronous DisplayBackgroundController::UpdateDisplay() call.
   base::RunLoop().RunUntilIdle();
   wallpaper_manager_test_utils::WaitAsyncWallpaperLoadFinished();
   EXPECT_EQ(WallpaperManager::WALLPAPER_RESOLUTION_LARGE,
             WallpaperManager::Get()->GetAppropriateResolution());
   EXPECT_EQ(1, observer.GetUpdateWallpaperCountAndReset());
 
-  // Max display size didn't chagne.
+  // Max display size didn't change.
   UpdateDisplay("900x800/r,400x1366");
   // Wait for asynchronous DisplayBackgroundController::UpdateDisplay() call.
   base::RunLoop().RunUntilIdle();
   wallpaper_manager_test_utils::WaitAsyncWallpaperLoadFinished();
   EXPECT_EQ(0, observer.GetUpdateWallpaperCountAndReset());
 }
 
 // Test that WallpaperManager loads the appropriate wallpaper
 // images as specified via command-line flags in various situations.
 // Splitting these into separate tests avoids needing to run animations.
@@ skipping 125 matching lines @@
 
   WallpaperManager::Get()->SetDefaultWallpaperNow(std::string());
   wallpaper_manager_test_utils::WaitAsyncWallpaperLoadFinished();
 
   EXPECT_TRUE(wallpaper_manager_test_utils::ImageIsNearColor(
       controller_->GetWallpaper(),
       wallpaper_manager_test_utils::kSmallDefaultWallpaperColor));
 }
 
 }  // namespace chromeos