tracing: get rid of files in TracingController interface

content/browser/android/tracing_controller_android.h

 // Copyright 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_ANDROID_TRACING_CONTROLLER_ANDROID_H_
 #define CONTENT_BROWSER_ANDROID_TRACING_CONTROLLER_ANDROID_H_
 
 #include <set>
 
 #include "base/android/jni_weak_ref.h"
@@ skipping 11 matching lines @@
   bool StartTracing(JNIEnv* env,
                     jobject obj,
                     jstring categories,
                     jstring trace_options);
   void StopTracing(JNIEnv* env, jobject obj, jstring jfilepath);
   bool GetKnownCategoryGroupsAsync(JNIEnv* env, jobject obj);
   static void GenerateTracingFilePath(base::FilePath* file_path);
 
  private:
   ~TracingControllerAndroid();
-  void OnTracingStopped(const base::FilePath& file_path);
+  void OnTracingStopped();
   void OnKnownCategoriesReceived(
       const std::set<std::string>& categories_received);
 
   JavaObjectWeakGlobalRef weak_java_object_;
   base::WeakPtrFactory<TracingControllerAndroid> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TracingControllerAndroid);
 };
 
 // Register this class's native methods through jni.
 bool RegisterTracingControllerAndroid(JNIEnv* env);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_TRACING_CONTROLLER_ANDROID_H_