Revert of DevTools: use explicit IPC messages for enabling/disabling tracing instead of intercepting protocol…

content/browser/devtools/devtools_protocol.h

Index: content/browser/devtools/devtools_protocol.h
diff --git a/content/browser/devtools/devtools_protocol.h b/content/browser/devtools/devtools_protocol.h
index cbc075b37157db00260f4fdd8b309e4d4ae5a089..71c24ab0f0176386581911d6cfe920b385b71a64 100644
--- a/content/browser/devtools/devtools_protocol.h
+++ b/content/browser/devtools/devtools_protocol.h
@@ -127,12 +127,18 @@
    public:
     typedef base::Callback<scoped_refptr<DevToolsProtocol::Response>(
         scoped_refptr<DevToolsProtocol::Command> command)> CommandHandler;
+    typedef base::Callback<void(
+        scoped_refptr<DevToolsProtocol::Notification> notification)>
+            NotificationHandler;
 
     virtual ~Handler();
 
     virtual scoped_refptr<DevToolsProtocol::Response> HandleCommand(
         scoped_refptr<DevToolsProtocol::Command> command);
 
+    virtual void HandleNotification(
+        scoped_refptr<DevToolsProtocol::Notification> notification);
+
     void SetNotifier(const Notifier& notifier);
 
    protected:
@@ -140,6 +146,9 @@
 
     void RegisterCommandHandler(const std::string& command,
                                 const CommandHandler& handler);
+
+    void RegisterNotificationHandler(const std::string& notification,
+                                     const NotificationHandler& handler);
 
     // Sends notification to the client. Takes ownership of |params|.
     void SendNotification(const std::string& method,
@@ -153,9 +162,11 @@
 
    private:
     typedef std::map<std::string, CommandHandler> CommandHandlers;
+    typedef std::map<std::string, NotificationHandler> NotificationHandlers;
 
     Notifier notifier_;
     CommandHandlers command_handlers_;
+    NotificationHandlers notification_handlers_;
 
     DISALLOW_COPY_AND_ASSIGN(Handler);
   };