Remove dependency of TranslateManager on g_browser_process

In order to move TranslateManager into the Translate component, all 
dependencies on chrome/ have to be removed.

BUG=335078

Review URL: https://codereview.chromium.org/175073002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254459 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254459