GitLab

Replaces GetToolbarActionViewForId with GetExtensionsToolbarContainer to
be used directly (with GetViewForId). This is intended to be used to pop
out and show bubbles which cannot be added to the ExtensionsContainer
interface as it is defined outside of Views.

This also implements GetDefaultExtensionDialogAnchorView inside
WebAppFrameToolbarView and updates BrowserView::GetExtensionsContainer
to work with ToolbarButtonProvider.

These two combined fix a crash when uninstalling an extension inside a
web-app window.

Bug: chromium:1021905
Change-Id: I9b9d23adca85600212846fa0fdb8db9d43dcf6ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1986305Reviewed-by: Charlene Yan <cyan@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728281}