Delete the temporary headers left behind in chrome\browser.  I've left browser_thread.h for another change, since 450 files include it.

TBR=avi
Review URL: http://codereview.chromium.org/6596060

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@76326 0039d316-1c4b-4281-b951-d872f2087c98
129 files changed