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The cast protocol allows a max message size of 64kb = 65536 bytes.
However Chrome does not enforce this correctly in the following ways:
- 65535 is used instead of 65536 as the max limit
- The limit should not include the 4 byte header, but Chrome includes it
(e.g., the IOBuffer used to read both only has 65535 bytes of capacity)

This patch fixes this by allocating 65536 + 4 bytes for the input
buffer, and modifying the check for message size against 65536.

Bug: 822611
Change-Id: I27121abb57dee5aee9741173e19cf0178184477d
Reviewed-on: https://chromium-review.googlesource.com/996475
Commit-Queue: Derek Cheng <imcheng@chromium.org>
Reviewed-by: Adam Parker <amp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548860}