Some minor sync cleanup and aftermath. Mostly just removing unused headers and adding others into the proper impl files.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6690016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@78215 0039d316-1c4b-4281-b951-d872f2087c98
22 files changed