Enable regular warnings for webkit/storage code (and fix them)

BUG=none

Review URL: https://codereview.chromium.org/39243002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230673 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230673
Add Java bridge for getting recently closed tabs.

This enables Java classes to query the list of recently closed tabs and
to clear that list.

BUG=308820

Review URL: https://codereview.chromium.org/36293002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230674 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230674