Disable Startup timebomb, ThreadWatcher and Shutdown timebomb.

R=jar@chromium.org
BUG=299180

Review URL: https://codereview.chromium.org/25675012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227182 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227182
content: Move MockWebClipboardImpl into content namespace.

This is a follow up to r226477 as requested by jam in
https://codereview.chromium.org/25378002/#msg17.

BUG=265753
R=jam@chromium.org

Review URL: https://codereview.chromium.org/25705004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227183 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227183