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This CL introduces no behavior changes.

chrome/browser/web_applications/web_app_migration_manager.h must not depend
on extensions, only forward declarations are visible.

This is a preparation CL to remove web_applications_on_extensions GN node.

WebAppProvider will be moved from web_applications_on_extensions to
general web_applications GN node.

Bug: 1065748
Change-Id: Ic74d8cdc9afe77472d13e27d889375add8e732d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517213Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823900}