Revert 242450 "Update some uses of UTF conversions in chrome/bro..."

> Update some uses of UTF conversions in chrome/browser to use the base:: namespace.
> 
> BUG=330556
> TEST=no change
> TBR=ben@chromium.org
> 
> Review URL: https://codereview.chromium.org/120953002

TBR=avi@chromium.org

Review URL: https://codereview.chromium.org/107423005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242454 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242454