Split infobar_test_helper.[h,mm] into separate pieces for the different classes defined within.

BUG=None
TEST=existing unit_tests.

Review URL: http://codereview.chromium.org/6612008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@76836 0039d316-1c4b-4281-b951-d872f2087c98
9 files changed