Delete didProgrammaticallyScroll plumbing.

This code was part of the feature that allowed developers to hide the top
controls (e.g. the url bar) by calling scrollTo. This feature was never
launched and never will be. See bug for further details.

BUG=295887

Review URL: https://codereview.chromium.org/26887008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229937 0039d316-1c4b-4281-b951-d872f2087c98
cc: Resources in parent compositor should not be considered wasted.

When a backing is released from its owner, but is in the parent
compositor, it is still in use and should not be considered wasted
since it can not be recycled. When the resource is returned from the
parent compositor it will be recycled or considered wasted.

Tests:
PrioritizedResourceTest.ReduceWastedMemory
PrioritizedResourceTest.InUseNotWastedMemory

R=ccameron, jbauman
BUG=292971

Review URL: https://codereview.chromium.org/33153003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229938 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229938