Move convolver, image_operations, and skia_utils from base/gfx to skia/ext....

skia/ext/platform_device_win.cc

Index: skia/ext/platform_device_win.cc
===================================================================
--- skia/ext/platform_device_win.cc	(revision 6142)
+++ skia/ext/platform_device_win.cc	(working copy)
@@ -5,12 +5,15 @@
 #include "skia/ext/platform_device_win.h"
 
 #include "base/logging.h"
-#include "base/gfx/skia_utils.h"
 #include "SkMatrix.h"
 #include "SkPath.h"
 #include "SkRegion.h"
 #include "SkUtils.h"
+#include "skia/ext/skia_utils_win.h"
 
+// TODO(brettw) remove this when this file is converted to namespace skia.
+using namespace skia;
+
 namespace gfx {
 
 PlatformDeviceWin::PlatformDeviceWin(const SkBitmap& bitmap)