tracing_controller: Eliminates extra parameter of StartAgentTracingDone

content/browser/tracing/tracing_controller_impl.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_TRACING_TRACING_CONTROLLER_IMPL_H_
 #define CONTENT_BROWSER_TRACING_TRACING_CONTROLLER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 149 matching lines @@
   void FinalizeGlobalMemoryDumpIfAllProcessesReplied();
 
   void OnWatchEventMatched();
 
   void SetEnabledOnFileThread(
       const base::trace_event::TraceConfig& trace_config,
       int mode,
       const base::Closure& callback);
   void SetDisabledOnFileThread(const base::Closure& callback);
   void OnStartAgentTracingDone(
-      const base::trace_event::TraceConfig& trace_config,
-      const StartTracingDoneCallback& callback);
+      const base::trace_event::TraceConfig& trace_config);
   void StopTracingAfterClockSync();
   void OnStopTracingDone();
   void OnStartMonitoringDone(
       const base::trace_event::TraceConfig& trace_config,
       const StartMonitoringDoneCallback& callback);
   void OnStopMonitoringDone(const StopMonitoringDoneCallback& callback);
 
   void OnMonitoringStateChanged(bool is_monitoring);
 
   int GetUniqueClockSyncID();
@@ skipping 51 matching lines @@
   std::set<TracingUI*> tracing_uis_;
   scoped_refptr<TraceDataSink> trace_data_sink_;
   scoped_refptr<TraceDataSink> monitoring_data_sink_;
 
   DISALLOW_COPY_AND_ASSIGN(TracingControllerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TRACING_TRACING_CONTROLLER_IMPL_H_