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This CL removes the flag gating layer masking for ClientViews of
dialogs and bubbles.

With this change dialogs and bubbles can use layer masking to
apply the appropriate clip to their ClientViews. Bubbles can opt into
layer masking by calling SetPaintClientToLayer(true).

The kEnableMDRoundedCornersOnDialogs flag continues to gate the
increased corner radius of bubbles and dialogs used in Chrome.

Bug: None
Change-Id: I4559ced170fa56b6b8974f4d9b2bd689668cbac9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490666
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824082}