Remove currently unused code

This code is currently unused and is contrary to the way in which we seem to be moving towards accomplishing this (i.e., device-specific optimization passes).

This is a partial revert of r13704 (First version of bitmap use tracking in SkPictureRecord - https://codereview.chromium.org/187833003/)

R=reed@google.com

Author: robertphillips@google.com

Review URL: https://codereview.chromium.org/237013002

git-svn-id: http://skia.googlecode.com/svn/trunk@14179 2bbb7eff-a529-9590-31e7-b0007b416f81
6 files changed