mac: Fix ui_resource_2x data pack path.

resource_bundle_mac still used an old 2x pack file naming scheme,
which caused loading of all 2x assets in ui/resources to fail
on Mac.

BUG=132910
TEST=Look at spinner in HiDPI mode. It's now HiDPI.
TBR=sky

Review URL: https://chromiumcodereview.appspot.com/10634019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@143502 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed