Headless: remove the check for id odd-ness, it breaks the new test harness.

Change-Id: Iec34b12698d698ffe10c2273adf71ff7b4850eb8
TBR: dgozman
Reviewed-on: https://chromium-review.googlesource.com/1066985
Commit-Queue: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560140}

headless/lib/browser/headless_devtools_client_impl.cc

@@ -111,10 +111,7 @@ void HeadlessDevToolsClientImpl::SendRawDevToolsMessage(
     NOTREACHED() << "Badly formed message " << json_message;
     return;
   }
-  DCHECK_EQ((id_value->GetInt() % 2), 1)
-      << "Raw devtools messages must have an odd ID.";
 #endif
-
   agent_host_->DispatchProtocolMessage(this, json_message);
 }