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This CL moves some logic from ExtensionUrlPatternIndexMatcher to its base class,
the RulesetMatcherInterface. In a subsequent CL, this common logic will also be
used by RegexRulesMatcher, which will evaluate regex rules.

This CL is split off of
https://chromium-review.googlesource.com/c/chromium/src/+/1892132 for ease of
review. It has no behavior change.

BUG=974391

Change-Id: I2073ed480e5f15611ce2ba4eb1ea29cf7de7f0a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910875
Auto-Submit: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715131}