Move `browsingData` extension API out of experimental.

As a drive-by, this CL also moves the files out of `.../browser/extensions` and
into `.../browser/extensions/api/browsingdata`.

BUG=115002,101244
TEST=browser_test (ExtensionBrowsingDataTest.*)

Review URL: http://codereview.chromium.org/9424036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@123472 0039d316-1c4b-4281-b951-d872f2087c98
24 files changed