Makes gfx::Screen an instance, rather than a collection of static methods.

This is in support of supporting separate Screen implementations on Aura for desktop and metro on Windows.

Some callsites are not yet correct, and noted with a reference to the http://crbug.com/133312. As-is those sites will behave the same as before this patch, but may not be correct once desktop/metro can run simultaneously.


BUG=133312


Review URL: https://chromiumcodereview.appspot.com/11030017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@161644 0039d316-1c4b-4281-b951-d872f2087c98
152 files changed