Add support for UA spoofing, and spoof Safari's UA string when loading URLs
from *.mail.live.com (to fix hotmail).

BUG=4111
R=wtc

Review URL: http://codereview.chromium.org/19025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@8764 0039d316-1c4b-4281-b951-d872f2087c98
12 files changed