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This CL hides the omnibox PWA install icon for installable sites if the
related_applications field lists a Chrome app that's already installed.

Example manifest field:
related_applications: [{
  "platform": "chrome_web_store",
  "id": "<extension id>"
}]

Bug: 949430
Change-Id: Ic0a5a7992811b008a1cceb382255ca1ecad35fbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1630078
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664627}