Convert string16 -> base::string16 in components/

BUG=

Review URL: https://codereview.chromium.org/13973004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@193682 0039d316-1c4b-4281-b951-d872f2087c98
121 files changed