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

content/browser/devtools/devtools_protocol.cc

Index: content/browser/devtools/devtools_protocol.cc
diff --git a/content/browser/devtools/devtools_protocol.cc b/content/browser/devtools/devtools_protocol.cc
index e3d531489d5ebf024dfe2bc4e621bbad8d14723e..c01f6f24ff60dcf61134a20128f2b221ecdcd3df 100644
--- a/content/browser/devtools/devtools_protocol.cc
+++ b/content/browser/devtools/devtools_protocol.cc
@@ -178,6 +178,15 @@
   return (it->second).Run(command);
 }
 
+void DevToolsProtocol::Handler::HandleNotification(
+    scoped_refptr<DevToolsProtocol::Notification> notification) {
+  NotificationHandlers::iterator it =
+    notification_handlers_.find(notification->method());
+  if (it == notification_handlers_.end())
+    return;
+  (it->second).Run(notification);
+}
+
 void DevToolsProtocol::Handler::SetNotifier(const Notifier& notifier) {
   notifier_ = notifier;
 }
@@ -189,6 +198,12 @@
     const std::string& command,
     const CommandHandler& handler) {
   command_handlers_[command] = handler;
+}
+
+void DevToolsProtocol::Handler::RegisterNotificationHandler(
+    const std::string& notification,
+    const NotificationHandler& handler) {
+  notification_handlers_[notification] = handler;
 }
 
 void DevToolsProtocol::Handler::SendNotification(