Remove GetActiveWebContents from browser_tabstrip.

BUG=167548
TEST=no functional change


Review URL: https://chromiumcodereview.appspot.com/12038056

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@179466 0039d316-1c4b-4281-b951-d872f2087c98
19 files changed