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This patch adds a test that pins an extension and verifies it appears in
the toolbar. In order to call IsActionVisibleOnToolbar, the visibility
of ExtensionsContainer overrides on ExtensionsToolbarContainer are moved
to public to match the superclass.

This patch also changes ExtensionsMenuViewUnitTest from a
BrowserWithTestWindowTest to a TestWithBrowserView. The pin button
requires the bubble to have a Widget before it can be clicked on, and
the most straightforward way to accomplish this is to have a
BrowserView to wire everything up correctly.

Bug: 984654
Change-Id: I5f81fd66567d09634a8c54a1cba26d9c963ec6d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917238
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716953}