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Before this CL, MessageSenderImpl and MessageReceiverImpl assumed that
the phone and Chrome OS device had the same endianness. This CL fixes
the issue by converting from host to network endianness when sending
messages and converting from network to host endianness when receiving
messages.

Bug: 1106937
Change-Id: Idaa3b56f9450030aaf2c5460a2cae18ec4869d82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453271
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814370}