Move the chromium.Interval to chrome.Interval as part of the benchmarking
extension.  This means that users will need to use --enable-benchmarking
to access it.  It really shouldn't be part of the exposed API.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/3126029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@57386 0039d316-1c4b-4281-b951-d872f2087c98
8 files changed