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ViewHostMsg_ResizeOrRepaint_ACK_Flags is no longer used. This removes it and
updates the comments on ViewMsg_SynchronizeVisualProperties to reflec the
current reality.

TBR=piman@chromium.org

Bug: 655231
Change-Id: I388ab96bd0bdf46a84f4e1e92bd8378fcc4dd834
Reviewed-on: https://chromium-review.googlesource.com/1216069
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590004}