[M67 Merge] Fixed CSP directive value parsing accepted character range

TBR=andypaicu@chromium.org

(cherry picked from commit 5b8466d84c801a9dfe140cb9a9f6be3a8caba230)

Bug: 845961
Change-Id: Ifc9609058cd7cbd268785db46534e3ed09da6ce3
Reviewed-on: https://chromium-review.googlesource.com/1071510
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#561834}
Reviewed-on: https://chromium-review.googlesource.com/1080931
Reviewed-by: Andrew Whalley <awhalley@chromium.org>
Cr-Commit-Position: refs/branch-heads/3396@{#723}
Cr-Branched-From: 9ef2aa869bc7bc0c089e255d698cca6e47d6b038-refs/heads/master@{#550428}
5 files changed