SetWindowLongPtrA takes a GWLP_WNDPROC

Right now it's a GWL_WNDPROC, which is the same value but technically incorrect and invalid on Win64.

BUG=166496
Review URL: https://codereview.chromium.org/12090079

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@179791 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed