[cc] Cleanup: modify the description of SkPictureContentLayerUpdater

R=enne@chromium.org
BUG=NONE
TEST=NONE (No functional change)

Review URL: https://codereview.chromium.org/130213002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243846 0039d316-1c4b-4281-b951-d872f2087c98

cc/resources/skpicture_content_layer_updater.h

@@ -14,11 +14,8 @@ namespace cc {
 
 class LayerPainter;
 
-// This class records the content_rect into an SkPicture. Subclasses, provide
-// different implementations of tile updating based on this recorded picture.
-// The BitmapSkPictureContentLayerUpdater and
-// FrameBufferSkPictureContentLayerUpdater are two examples of such
-// implementations.
+// This class records the content_rect into an SkPicture. Subclass provides
+// SkCanvas to DrawPicture() for tile updating based on this recorded picture.
 class SkPictureContentLayerUpdater : public ContentLayerUpdater {
  protected:
   SkPictureContentLayerUpdater(