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As BrowserActionsContainer disappears with the introduction of
ExtensionsToolbarContainer this CL adds CHECKs to make sure that that
experiment is not enabled whenever GetBrowserActionsContainer gets
called.

This change adds |GetToolbarActionViewForId| and
|GetDefaultExtensionDialogAnchorView| to the ToolbarButtonProvider
interface so requests for those do not need to go through
BrowserActionsContainer.

As a a side effect ExtensionUninstallDialogView can now anchor to
pinned extensions when this experiment is enabled (as they are visible),
but like the extension-installed dialog they cannot pop out the
extension to display the dialog anchor yet.

Bug: chromium:985834
Change-Id: I0bbc8da1d501846e72fc06987343dd758e83f922
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1731301Reviewed-by: Caroline Rising <corising@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683383}