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This removes most remaining references to ConnectionFilter and its
related headers. Any actual usage here is replaced with use of the
ChildProcess API in conjunction with a BinderMap.

Also deletes common_browser_interfaces.cc/h which haven't actually
been built for some time now.

Bug: 977637
Change-Id: Iaff4abfa569414c4f143292ae32dec2beb853c51
Tbr: boliu@chromium.org
Tbr: yucliu@chromium.org
Tbr: rouslan@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910846
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715738}