Gardening: Add missing changes in Deps file.
Minor cleanup in DRWH.

This patch removes functions which are no more part of the base
class. Also moves functions over-ridden from DesktopRootWindowHost
to correct place.

GrabSnapshot: https://chromiumcodereview.appspot.com/14594002
SetInactiveRenderingDisabled: https://codereview.chromium.org/23072016