Use proper namespace in skia/ext

chrome/browser/ui/cocoa/apps/native_app_window_cocoa_browsertest.mm

 // Copyright 2013 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 "extensions/browser/app_window/native_app_window.h"
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/foundation_util.h"
 #import "base/mac/mac_util.h"
@@ skipping 620 matching lines @@
 }
 
 IN_PROC_BROWSER_TEST_P(NativeAppWindowCocoaBrowserTest, ControlsFrameless) {
   TestControls(CreateTestAppWindow("{\"frame\": \"none\"}"));
 }
 
 namespace {
 
 // Convert a color constant to an NSColor that can be compared with |bitmap|.
 NSColor* ColorInBitmapColorSpace(SkColor color, NSBitmapImageRep* bitmap) {
-  return [gfx::SkColorToSRGBNSColor(color)
+  return [skia::SkColorToSRGBNSColor(color)
       colorUsingColorSpace:[bitmap colorSpace]];
 }
 
 // Take a screenshot of the window, including its native frame.
 NSBitmapImageRep* ScreenshotNSWindow(NSWindow* window) {
   // When building with 10.10 SDK and running on 10.9, -[NSView
   // cacheDisplayInRect] does not seem to capture subviews. This seems related
   // to the frame view having a layer with 10.10 SDK, but is probably a bug
   // since it doesn't manifest on 10.10. See http://crbug.com/508722.
   // In this case, take a screenshot using the CGWindowList API instead. The
@@ skipping 57 matching lines @@
   [expected_color getComponents:expected_components];
   [color getComponents:color_components];
   EXPECT_NEAR(expected_components[0], color_components[0], 0.01);
   EXPECT_NEAR(expected_components[1], color_components[1], 0.01);
   EXPECT_NEAR(expected_components[2], color_components[2], 0.01);
 }
 
 INSTANTIATE_TEST_CASE_P(NativeAppWindowCocoaBrowserTestInstance,
                         NativeAppWindowCocoaBrowserTest,
                         ::testing::Bool());