Unify IsURLParameter() logic between HTML{Object,Param}Element.cpp

Add missing case of "url" param name that triggered XSSAuditor bypass.
Make one corresponding change to keep behaviour as stable as possible.

Bug: 783618
Change-Id: Ic74bf385d3604e6ff71221ae4104e88c2201e118
Reviewed-on: https://chromium-review.googlesource.com/764113
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516003}
12 files changed