Use the native frame for the task manager on Linux Aura

BUG= 348437
TEST=Manual, see bug

Review URL: https://codereview.chromium.org/274273004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271086 0039d316-1c4b-4281-b951-d872f2087c98
10 files changed