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Stop inheriting from it and instead use the two classes separately, with
PostMessageServiceConnection abstracted out of PostMessageHandler behind
the PostMessageBackend interface added in change 1299016.

This means we now store a PostMessageServiceConnection in SessionParams
and call to it instead of PostMessageHandler for behaviour relating to
the service connection.

The result of this change is that PostMessageHandler can be used without
a service connection, allowing us to use it directly from CustomTabActivity
in a future CL.

Bug: 898840
Change-Id: Ifd06ee0a803ecd82c350d7b5466bf0a0ee35440b
Reviewed-on: https://chromium-review.googlesource.com/c/1299143
Commit-Queue: David Barker <barkerd@google.com>
Reviewed-by: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603516}