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ContentVerifier::ShouldVerifyAnyPaths forces verification of
JavaScript and html files by checking the extension of the
resource (.js or .html/.htm) as they are considered sensitive
resources.

However, it didn't used to take case variants of extension into
account, this CL fixes that by turning comparison of extension
of files case-insensitive on all platforms.

Added unit test for the behavior change.

Bug: 1051396
Test: See bug description
Change-Id: I0fed253ad5241db5b89c8abf6d0ab445dd403b0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071486
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Oleg Davydov <burunduk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744744}