GitLab

Separate request proto fill in logic from the origin function, which
make it easier for unit testing. The test is mainly for url sanitization.

Bug: 1017440
Change-Id: I8626aebb8459972b248330a396e1e23a40dfb474
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877813
Commit-Queue: Xinghui Lu <xinghuilu@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709143}