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This CL adds priority checking between matching modifyHeaders and allow/
allowAllRequests rules in an extension. Currently, if there is a
matching allow/allowAllRequests rule, it will override any removeHeaders
rules since removeHeaders rules don't have priority.

Since modifyHeaders rules have priority, within an extension, the
matching allow/allowAllRequests rule with the highest priority should
override modifyHeaders rules with equal or lesser priority.

Bug: 947591
Change-Id: Ifc8e4e18ea1d33811d4458574e474603cea44461
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2172640
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769940}