Start trimming headers included in the slowest to compile files.

Big chunk in the automation code.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/3056007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53246 0039d316-1c4b-4281-b951-d872f2087c98
23 files changed