tracing: get rid of files in TracingController interface

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 fe270bd847264bd4eb3283885a8cf0bce90af6ae..fa6b7b69a16e5f591ad351ca8b5d8468a6f0cc63 100644
--- a/content/browser/devtools/devtools_tracing_handler.h
+++ b/content/browser/devtools/devtools_tracing_handler.h
@@ -33,10 +33,11 @@ class DevToolsTracingHandler : public DevToolsProtocol::Handler {
   void EnableTracing(const std::string& category_filter);
   void DisableTracing();
 
- private:
-  void BeginReadingRecordingResult(const base::FilePath& path);
-  void ReadRecordingResult(const scoped_refptr<base::RefCountedString>& result);
+
   void OnTraceDataCollected(const std::string& trace_fragment);
+  void OnTraceComplete();
+
+ private:
   void OnRecordingEnabled(scoped_refptr<DevToolsProtocol::Command> command);
   void OnBufferUsage(float usage);
 
@@ -55,9 +56,7 @@ class DevToolsTracingHandler : public DevToolsProtocol::Handler {
 
   void SetupTimer(double usage_reporting_interval);
 
-  void DisableRecording(
-      const TracingController::TracingFileResultCallback& callback =
-          TracingController::TracingFileResultCallback());
+  void DisableRecording(bool abort);
 
   base::WeakPtrFactory<DevToolsTracingHandler> weak_factory_;
   scoped_ptr<base::Timer> buffer_usage_poll_timer_;