Reject SRI blindly when response is ineligible for validation

We should reject SRI blindly when the response is not eligible for
integrity validation. The logic is correctly implemented in
ResourceLoader but not in FetchManager.

(cherry picked from commit c7bfc96d2c218e8b1592d379da1fe256767cdf27)

Bug: 812667
Change-Id: I03027dbefdd8068b6dcca6d52156964749ab1c44
Reviewed-on: https://chromium-review.googlesource.com/948229
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#541092}
Reviewed-on: https://chromium-review.googlesource.com/954778
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/branch-heads/3355@{#5}
Cr-Branched-From: 31d0bb0369f909177f2ce90b439f296bcf9c90cb-refs/heads/master@{#539001}
2 files changed