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When a hosted app URL also corresponds to an isolated origin, the
isolated origin takes precedence, and the corresponding SiteInstance
won't use the effective URL for the hosted app.  However, this logic
needs to exclude CWS, which still needs to resolve to its effective
URL, so that the corresponding process ends up in the ProcessMap for
the CWS extension ID.  Otherwise, security checks such as CanCommitURL
won't allow CWS navigations to succeed.

Bug: 788837
Change-Id: I2b8d03d044e72bb9b8f71cb4c3accfba8d907ac4
Reviewed-on: https://chromium-review.googlesource.com/792596Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519701}