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Current code just uses the key_event.nativeKeyCode which is copied
from the Windows' lParam. The proper scancode needs to be shifted
and masked out of the lParam (as is done for UsbKeyCodeForKeyboardEvent.

BUG=325015

Review URL: https://codereview.chromium.org/100533003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238362 0039d316-1c4b-4281-b951-d872f2087c98