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The resize handlers are now necessary as aura-mus dispatches events
using the same path as aura non-mus. Without this change the
MoveEventHandler installed on the window in the mash side doesn't get
events and resize fails.

BUG=none
TEST=none
R=msw@chromium.org

Review-Url: https://codereview.chromium.org/2618113002
Cr-Commit-Position: refs/heads/master@{#442097}