[DevTools] Tracing handler keeps running even after devtools frontend has been closed.

content/browser/devtools/devtools_tracing_handler.h

Index: content/browser/devtools/devtools_tracing_handler.h
diff --git a/content/browser/devtools/devtools_tracing_handler.h b/content/browser/devtools/devtools_tracing_handler.h
index c41f1ec9791d65587d28aacf8d95fbfdeced3f1d..787a123f666e57a708f7601bdaa86c4a2c5e4dd9 100644
--- a/content/browser/devtools/devtools_tracing_handler.h
+++ b/content/browser/devtools/devtools_tracing_handler.h
@@ -24,6 +24,8 @@ class DevToolsTracingHandler : public DevToolsProtocol::Handler {
   explicit DevToolsTracingHandler(Target target);
   virtual ~DevToolsTracingHandler();
 
+  void OnClientDetached();
+
  private:
   void BeginReadingRecordingResult(const base::FilePath& path);
   void ReadRecordingResult(const scoped_refptr<base::RefCountedString>& result);
@@ -38,6 +40,10 @@ class DevToolsTracingHandler : public DevToolsProtocol::Handler {
 
   TracingController::Options TraceOptionsFromString(const std::string& options);
 
+  void DisableRecording(
+      const TracingController::TracingFileResultCallback& callback =
+          TracingController::TracingFileResultCallback());
+
   base::WeakPtrFactory<DevToolsTracingHandler> weak_factory_;
   scoped_ptr<base::Timer> buffer_usage_poll_timer_;
   Target target_;