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Platform app resources should never load in a tab. However currently,
it's possible for browser initiated navigations to bypass that
restriction on redirects. Fix that by adding an explicit check in
ExtensionNavigationThrottle to ensure that navigations to platform app
resources only succeed in certain cases. Also, add a regression test.

BUG=1110551

Change-Id: If11f7f1f9649c8a3f7960cd51d18ef902ac272d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2347086
Auto-Submit: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799859}