CSP: Strip reported URLs for 'frame-src' and 'object-src'.
The relaxation that landed in
https://codereview.chromium.org/2002943002
was a bit too relaxed, and leaks navigation targets cross-origin for
'frame-src' and 'object-src' violations.
This patch reverts to the old behavior for those two directives.
BUG=
633306
Review-Url:
https://codereview.chromium.org/2255103002
Cr-Commit-Position: refs/heads/master@{#412809}
(cherry picked from commit 94a6ff53682eac87184c1682b63faf6110325174)