Add URL validation to navigations initiated via RenderFrameProxyHosts.

Add URL validation to navigations initiated via RenderFrameProxyHosts.

When we changed RenderFrameProxyHost::OnOpenURL to use the transfer
logic in r377832, we lost FilterURL validation provided by
RenderFrameHostImpl::OpenURL.  This CL adds that validation to
navigations initiated via proxies.

BUG=595339
TBR=creis@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_site_isolation

Review URL: https://codereview.chromium.org/1812723002

Cr-Commit-Position: refs/heads/master@{#381788}
(cherry picked from commit 5b50b674d36956c84a499b4f93e65a874de28713)

Committed: https://chromium.googlesource.com/chromium/src/+/52505b8cec39e5dcbf8e04f6dbe7ea1b92890e49

[alexmos, 2016-03-22 23:51:29]

Description was changed from

==========
Add URL validation to navigations initiated via RenderFrameProxyHosts.

When we changed RenderFrameProxyHost::OnOpenURL to use the transfer
logic in r377832, we lost FilterURL validation provided by
RenderFrameHostImpl::OpenURL.  This CL adds that validation to
navigations initiated via proxies.

BUG=595339
TBR=creis@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_site_isolation

Review URL: https://codereview.chromium.org/1812723002

Cr-Commit-Position: refs/heads/master@{#381788}
(cherry picked from commit 5b50b674d36956c84a499b4f93e65a874de28713)
==========

to

==========
Add URL validation to navigations initiated via RenderFrameProxyHosts.

When we changed RenderFrameProxyHost::OnOpenURL to use the transfer
logic in r377832, we lost FilterURL validation provided by
RenderFrameHostImpl::OpenURL.  This CL adds that validation to
navigations initiated via proxies.

BUG=595339
TBR=creis@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_site_isolation

Review URL: https://codereview.chromium.org/1812723002

Cr-Commit-Position: refs/heads/master@{#381788}
(cherry picked from commit 5b50b674d36956c84a499b4f93e65a874de28713)

Committed:
https://chromium.googlesource.com/chromium/src/+/52505b8cec39e5dcbf8e04f6dbe7...
==========

[alexmos, 2016-03-22 23:51:30]

Committed patchset #1 (id:1) manually as
52505b8cec39e5dcbf8e04f6dbe7ea1b92890e49.