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The window of menu should have the WS_EX_TOOLWINDOW style, otherwise
when showing tray context menu on Windows, its window would show in
taskbar.

Bug: 1094772
Change-Id: If822315b6b8d7322b919fb1c5e550c96cbbdb823
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2245941Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781667}