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Switch chromoting_messages.h to new variadic macros.

The IPC_MESSAGE_CONTROL[0-5] macros have been deprecated in favor of a
new variadic IPC_MESSAGE_CONTROL macro.

Change-Id: I64a0e8c7ec3c51b387de615950f93b6d5798d3a6
Reviewed-on: https://chromium-review.googlesource.com/c/1354102
Commit-Queue: Erik Jensen <rkjnsn@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612828}