Limit protection of clients[0-9]*.google.com to requests from browser.

Limit protection of clients[0-9]*.google.com to requests from browser.

The WebRequest API protected network requests to clients[0-9]*.google.com from
being visible or modified by extensions. This was built under the assumption
that these domains are only used by Chrome internally, which was invalid. This
CL restrictes the protection to only those network requests that originate from
the browser. Requests from the renderers are exposed to extensions.

BUG=715184
TEST=https://crbug.com/715184#c12

Review-Url: https://codereview.chromium.org/2845943003
Cr-Original-Commit-Position: refs/heads/master@{#470949}
Review-Url: https://codereview.chromium.org/2886573003 .
Cr-Commit-Position: refs/branch-heads/3071@{#578}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/210763c75ffa0245904ff82e31d6e08e5b28ed89

[Mike West, 2017-05-16 11:27:22]

Description was changed from

==========
Limit protection of clients[0-9]*.google.com to requests from browser.

The WebRequest API protected network requests to clients[0-9]*.google.com from
being visible or modified by extensions. This was built under the assumption
that these domains are only used by Chrome internally, which was invalid. This
CL restrictes the protection to only those network requests that originate from
the browser. Requests from the renderers are exposed to extensions.

BUG=715184
TEST=https://crbug.com/715184#c12

Review-Url: https://codereview.chromium.org/2845943003
Cr-Commit-Position: refs/heads/master@{#470949}
(cherry picked from commit 14ca4ff2719095e31e2f4cc49d1d5e8d5af175ce)
==========

to

==========
Limit protection of clients[0-9]*.google.com to requests from browser.

The WebRequest API protected network requests to clients[0-9]*.google.com from
being visible or modified by extensions. This was built under the assumption
that these domains are only used by Chrome internally, which was invalid. This
CL restrictes the protection to only those network requests that originate from
the browser. Requests from the renderers are exposed to extensions.

BUG=715184
TEST=https://crbug.com/715184#c12

Review-Url: https://codereview.chromium.org/2845943003
Cr-Original-Commit-Position: refs/heads/master@{#470949}
Review-Url: https://codereview.chromium.org/2886573003 .
Cr-Commit-Position: refs/branch-heads/3071@{#578}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/210763c75ffa0245904ff82e31d6...
==========

[Mike West, 2017-05-16 11:27:23]

Committed patchset #1 (id:1) manually as
210763c75ffa0245904ff82e31d6e08e5b28ed89.