More fixes to enable ios build with policy.

This change fixes //chrome code that breaks when built with policy enabled
on ios.

BUG=275292

Review URL: https://codereview.chromium.org/138163015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246375 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246375