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We were trying to remove a child view from the wrong parent. Fix this.

This makes BrowserActionApiTest.Basic pass with the ExtensionsMenu
enabled.

Bug: 984654
Change-Id: I5e648e487fa173370f17eb841587f6136eb67e20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2019926Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735027}