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This CL is a preparation to use SystemWebAppManager in WebAppTabHelper.

Bug: 1024655
Change-Id: Id2a4e71e852696bfbf8386ffdd221d523ab55161
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040755
Commit-Queue: Jiewei Qian  <qjw@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739236}