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With this change, specifying port in the manifest URLPattern
works even for CORS bypassing rules.

Bug: 936900
Change-Id: I3744b65307c923c9c593efef7a41a651ab67d494
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1619530
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662973}