ui/gfx: Make gfx::Canvas inherit from gfx::CanvasSkia.

The final goal is to merge these two classes into a single gfx::Canvas class.

BUG=116572
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[email protected]

Review URL: https://chromiumcodereview.appspot.com/9562038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@125735 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ui/aura/demo/demo_main.cc b/ui/aura/demo/demo_main.cc
index d6eccc2..be1c684 100644
--- a/ui/aura/demo/demo_main.cc
+++ b/ui/aura/demo/demo_main.cc
@@ -15,7 +15,7 @@
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/aura/root_window.h"
 #include "ui/base/ui_base_paths.h"
-#include "ui/gfx/canvas_skia.h"
+#include "ui/gfx/canvas.h"
 #include "ui/gfx/compositor/test/compositor_test_support.h"
 #include "ui/gfx/rect.h"