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r470769 started observing private AppKit run loop modes to keep
UI and web pages responsive while menus were fading out, but it
interacted badly with app-modal dialogs.

This re-enables r470769, but only in 3 places:
 - Web page context menus
 - Web page <select> menus
 - menus run from toolkit-views UI.

      pause briefly when either the <select> menu or the right-
      click context menu are fading out. (The main menubar and the
      Chrome app/wrench menu still cause a brief pause when dismissed).

Bug: 726200, 602914, 640466, 652007
Test: https://jsfiddle.net/kvmy8q9d/5/ - the animation shouldn't
Change-Id: Idf769c1f830ccb3ddc67205acb9e86aac2ec0460
Reviewed-on: https://chromium-review.googlesource.com/647836Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#503112}