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This is in preparation for the file handling origin trial, where file
handling will be available on a per app basis. This CL makes no
functional changes but instead changes the API used to check if file
handling is enabled.

Old Check:
if (base::FeatureList::IsEnable(blink::features::kFileHandlingAPI))

New Check:
if (file_handler_manager().IsFileHandlingAPIAvailable(app_id))

Currently, the implementation of |IsFileHandlingAPIAvailable| is
simply the old check. In https://crrev.com/c/1940001, this will
be changed to also be true if |app_id| has a valid FileHandling API
origin trial token.

Note: This also restricts file handling in extensions to extensions
where from_bookmark() is true (this should have always been the case).

Bug: 1028448
Change-Id: I525bb7bf03f052b79721fdc13fb154b34fa411a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2016688Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735753}