More GetDefaultProfile removals

BUG=322682
TEST=test covered by unit tests

Review URL: https://codereview.chromium.org/102603010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241356 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241356