Revert 192525 "Context menu on views must show on mouse down for..."
> Context menu on views must show on mouse down for non-WIN.
> This is mostly a copy of https://chromiumcodereview.appspot.com/
12395010 which was reverted due to a regression (https://code.google.com/p/chromium/issues/detail?id=189100). I have attempted to fix that regression here.
>
> BUG=189100,179381
>
> Review URL: https://chromiumcodereview.appspot.com/
12529012
TBR=varunjain@chromium.org
Review URL: https://codereview.chromium.org/
13565004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@192532 0039d316-1c4b-4281-b951-d872f2087c98