url: Fix the TODO in url_parse.h header.

this removes url/url_parse.h header, since it was just a pass through
for url/third_party/mozilla/url_parse.h, and update the call sites.

BUG=None
R=brettw@chromium.org

Review URL: https://codereview.chromium.org/1152373003

Cr-Commit-Position: refs/heads/master@{#331390}
32 files changed