ui/gfx: Rename almost all entries from gfx::CanvasSkia to gfx::Canvas.

BUG=116572
R=asvitkine@chromium.org
TBR=sky@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9705063

git-svn-id: http://src.chromium.org/svn/trunk/src/build@126935 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -271,7 +271,7 @@
       'enable_plugin_installation%': 1,
 
       # Specifies whether to use canvas_skia_skia.cc in place of platform
-      # specific implementations of CanvasSkia. Affects text drawing in the
+      # specific implementations of gfx::Canvas. Affects text drawing in the
       # Chrome UI.
       # TODO(asvitkine): Enable this on all platforms and delete this flag.
       #                  http://crbug.com/105550