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This reverts commit a3996e55.

Reason for revert: This is causing GlobalErrorBubbleViewTest.Basic
to fail in MSAN builds (example failing build: https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Linux%20ChromiumOS%20MSan%20Tests/12590)

Original change's description:
> Change BubbleDialogDelegateView RTL mirroring to happen when setting the arrow.
> 
> Previously this was done during creation of the nonclient view. This created issues in cases where the arrow was explicitly reset to a value fitting for only LTR after nonclient view creation.
> 
> Bug: 956001
> Change-Id: I2d71c3a97df1192337f7548ab1da733604526c3a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585930
> Commit-Queue: Caroline Rising <corising@chromium.org>
> Reviewed-by: Dana Fried <dfried@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#654625}

TBR=dfried@chromium.org,corising@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 956001
Change-Id: Ib4367b996d9c4e3418e8463558912f641713a5fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1588440Reviewed-by: Adithya Srinivasan <adithyas@chromium.org>
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654871}