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WebAppFileHandlerManager::GetAllFileHandlers involved a technically-
safe-but-suboptimal static downcast from AppRegistrar to
WebAppRegistrar. This CL implements an explicit safe downcast method
on AppRegistrar and its children.

Bug: 938103
Change-Id: I2363916cc6e78bc6cb612856eb29e5b84571749a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978079Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Commit-Queue: Robert Woods <robertwoods@google.com>
Cr-Commit-Position: refs/heads/master@{#727340}