Use proper namespace in skia/ext

ui/gfx/image/image_skia_util_ios.mm

 // Copyright 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 "ui/gfx/image/image_skia_util_ios.h"
 
 #include <UIKit/UIKit.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_cftyperef.h"
@@ skipping 13 matching lines @@
   return image_skia;
 }
 
 gfx::ImageSkiaRep ImageSkiaRepOfScaleFromUIImage(UIImage* image, float scale) {
   if (!image)
     return gfx::ImageSkiaRep();
 
   CGSize size = image.size;
   CGSize desired_size_for_scale =
       CGSizeMake(size.width * scale, size.height * scale);
-  SkBitmap bitmap(gfx::CGImageToSkBitmap(image.CGImage,
-                                         desired_size_for_scale,
-                                         false));
+  SkBitmap bitmap(skia::CGImageToSkBitmap(image.CGImage,
+                                          desired_size_for_scale,
+                                          false));
   return gfx::ImageSkiaRep(bitmap, scale);
 }
 
 UIImage* UIImageFromImageSkia(const gfx::ImageSkia& image_skia) {
   return UIImageFromImageSkiaRep(
       image_skia.GetRepresentation(ImageSkia::GetSupportedScales().back()));
 }
 
 UIImage* UIImageFromImageSkiaRep(const gfx::ImageSkiaRep& image_skia_rep) {
   if (image_skia_rep.is_null())
     return nil;
 
   float scale = image_skia_rep.scale();
   base::ScopedCFTypeRef<CGColorSpaceRef> color_space(
       CGColorSpaceCreateDeviceRGB());
-  return gfx::SkBitmapToUIImageWithColorSpace(image_skia_rep.sk_bitmap(), scale,
-                                              color_space);
+  return skia::SkBitmapToUIImageWithColorSpace(image_skia_rep.sk_bitmap(),
+                                               scale, color_space);
 }
 
 }  // namespace gfx