Switch to using TimeTicks rather than Time in message loops

Switch to using TimeTicks rather than Time so that we
are not dependent on changes in the system clock.

r=mbelshe,darin
Review URL: http://codereview.chromium.org/3884001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@65322 0039d316-1c4b-4281-b951-d872f2087c98
14 files changed