Fix mismatched prototype in InputDispatcher constructor

Minor bug, but it breaks the Win64 compile because a
WPARAM is not a UINT in 64-bit.

BUG=166496
R=jcivelli@chromium.org
Review URL: https://codereview.chromium.org/12294029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@183415 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed