[mac,win] Enable checking for 64-bit Pepper Flash

BUG=225777,179716
TEST=unit tests pass

Review URL: https://codereview.chromium.org/394923005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284724 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed