Update uses of UTF conversions in chrome/installer, chrome/renderer, chrome/service, chrome/test, chrome/third_party, chrome/tools, chrome/utility to use the base:: namespace.

BUG=330556
TEST=no change
TBR=ben@chromium.org

Review URL: https://codereview.chromium.org/119103004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242472 0039d316-1c4b-4281-b951-d872f2087c98
Update some uses of char16 to use the base:: namespace.

BUG=329295
TEST=no change
TBR=ben@chromium.org

Review URL: https://codereview.chromium.org/113403006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242503 0039d316-1c4b-4281-b951-d872f2087c98