Fix remoting NM hosts to verify that incoming messages are dictionaries.

After crrev.com/295851 the PipeMessagingChannel verifies that incoming
messages are dictionaries and then passes them as base::Value to
OnMessage() and then OnMessage() implementation static_cast<> them to
base::DictionaryValue. This is fragile, and also it shouldn't be
PipeMessagingChannel's responsibility to verify format of the messages
it reads. Moved the check to OnMessage() implementations.

Review URL: https://codereview.chromium.org/615543004

Cr-Commit-Position: refs/heads/master@{#297274}

0 files changed, 0 insertions, 0 deletions