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Add internet_page_browser_proxy to hold Chrome.send() for external VPN
providers which are not going to be depericated.

Bug: 784573
Test: Manual
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Icfcab81de857864611c4a0cde89245853513bcc5
Reviewed-on: https://chromium-review.googlesource.com/779712
Commit-Queue: Long Cheng <lgcheng@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519936}