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InstallableManager caches the data it fetches as part of the
installability check. This means that sites which change their manifest,
or inject a manifest after the check is run are incorrectly classified.

This CL makes InstallableManager listen to the
WebContentsObserver::DidUpdateWebManifestURL() method, and invalidates
its internal state when the method fires. This addresses the issue by
making InstallableManager refetch data when we know that the manifest
URL is different.

Tests are added to ensure the correct behaviour.

BUG=792299

Change-Id: If73128b7b86bd741c16235c8a8e7ec5f0caeb165
Reviewed-on: https://chromium-review.googlesource.com/809994
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522038}