Remove associated interface registration from ChannelProxy

Remove associated interface registration from ChannelProxy

ChannelProxy already delegates incoming associated interface requests
to its Listener if they weren't handled by the Channel.

We use this instead of having ChannelProxy register UI-thread-posting
binders on the Channel itself. It's simpler and safer this way.

This is a reland of the previous merge, now with 100% fewer compile
failures!

BUG=683773
R=jam@chromium.org

Review-Url: https://codereview.chromium.org/2653973002
Cr-Commit-Position: refs/heads/master@{#445886}
(cherry picked from commit 70bbb59493f1111361e3b1bedd04a14fedb334f4)

Review-Url: https://codereview.chromium.org/2651053004 .
Cr-Commit-Position: refs/branch-heads/2987@{#92}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/3594a5c4754dfd0d80df18d05bf5b6c94193d781

[Ken Rockot(use gerrit already), 2017-01-25 18:34:21]

Description was changed from

==========
Remove associated interface registration from ChannelProxy

ChannelProxy already delegates incoming associated interface requests
to its Listener if they weren't handled by the Channel.

We use this instead of having ChannelProxy register UI-thread-posting
binders on the Channel itself. It's simpler and safer this way.

This is a reland of the previous merge, now with 100% fewer compile
failures!

BUG=683773
R=jam@chromium.org

Review-Url: https://codereview.chromium.org/2653973002
Cr-Commit-Position: refs/heads/master@{#445886}
(cherry picked from commit 70bbb59493f1111361e3b1bedd04a14fedb334f4)
==========

to

==========
Remove associated interface registration from ChannelProxy

ChannelProxy already delegates incoming associated interface requests
to its Listener if they weren't handled by the Channel.

We use this instead of having ChannelProxy register UI-thread-posting
binders on the Channel itself. It's simpler and safer this way.

This is a reland of the previous merge, now with 100% fewer compile
failures!

BUG=683773
R=jam@chromium.org

Review-Url: https://codereview.chromium.org/2653973002
Cr-Commit-Position: refs/heads/master@{#445886}
(cherry picked from commit 70bbb59493f1111361e3b1bedd04a14fedb334f4)

Review-Url: https://codereview.chromium.org/2651053004 .
Cr-Commit-Position: refs/branch-heads/2987@{#92}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/3594a5c4754dfd0d80df18d05bf5...
==========

[Ken Rockot(use gerrit already), 2017-01-25 18:34:22]

Committed patchset #2 (id:20001) manually as
3594a5c4754dfd0d80df18d05bf5b6c94193d781.