Start the process of making Favicon into a Browser Component.

Start the process of making Favicon into a Browser Component.

This means, add the intended DEPS rules for a Browser Component
(depend on nothing within chrome/browser outside the component except
chrome/browser/api) and add a temporary owner for pure refactoring
changes so that such changes can be done more quickly. Larger changes
(that affect functionality or interfaces in non-refactoring ways) will
still be sent to a proper OWNER.

With the new DEPS, a presubmit check will warn developers that add new
temporarily-allowed (the files designated with a "!" rule in the DEPS
file).

BUG=146851

Review URL: https://chromiumcodereview.appspot.com/10928053

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@157370 0039d316-1c4b-4281-b951-d872f2087c98