Remove IPC channel IDs.

ipc/ipc_logging.h

Index: ipc/ipc_logging.h
diff --git a/ipc/ipc_logging.h b/ipc/ipc_logging.h
index e567921624e9a53533cb448b9762fdb5009fe9a1..af490f0c91e7fce1a2f94aab626252fa29e59d81 100644
--- a/ipc/ipc_logging.h
+++ b/ipc/ipc_logging.h
@@ -67,10 +67,9 @@ class IPC_EXPORT Logging {
   // received.
   void OnReceivedLoggingMessage(const Message& message);
 
-  void OnSendMessage(Message* message, const std::string& channel_id);
+  void OnSendMessage(Message* message);
   void OnPreDispatchMessage(const Message& message);
-  void OnPostDispatchMessage(const Message& message,
-                             const std::string& channel_id);
+  void OnPostDispatchMessage(const Message& message);
 
   // Like the *MsgLog functions declared for each message class, except this
   // calls the correct one based on the message type automatically.  Defined in