Add better check for page ID in chrome-proxy header

Change-Id: I1e38e6d983a0f46c8ace24bfe19a97600f90675b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1575127
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: rajendrant <rajendrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652452}
1 file changed