Remove dependency from Mac's breakpad implementation to policies.

BUG=247431
R=bauerb@chromium.org

Review URL: https://codereview.chromium.org/26000004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227209 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227209