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If you open app window (e.g., chrome://apps,
right click on Youtube, check "open in window", and open it),
then left click just to the right of "Youtube" in the title bar of the app
window, and then right click, a second context menu gets opened.

This CL makes HwndMessageHandler ignore the right click when displaying
a system menu opened with left click.

Bug: 1053460
Change-Id: I0c32cf30995ce6e970c93d40a2e20b7b2f63d3a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071253Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746167}