Fixed a leak in StringTraceDataSink following b47076f

content/browser/tracing/tracing_controller_impl.cc

 // 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.
 #include "content/browser/tracing/tracing_controller_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/files/file_util.h"
 #include "base/json/string_escape.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 117 matching lines @@
   }
   virtual void SetSystemTrace(const std::string& data) OVERRIDE {
     system_trace_ = data;
   }
   virtual void Close() OVERRIDE {
     std::string result = "{\"traceEvents\":[" + trace_ + "]";
     if (!system_trace_.empty())
       result += ",\"systemTraceEvents\": " + system_trace_;
     result += "}";
 
-    completion_callback_.Run(base::RefCountedString::TakeString(&result));
+    scoped_refptr<base::RefCountedString> str =
+        base::RefCountedString::TakeString(&result);
+    completion_callback_.Run(str.get());
   }
 
  private:
   virtual ~StringTraceDataSink() {}
 
   std::string trace_;
   std::string system_trace_;
   CompletionCallback completion_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(StringTraceDataSink);
@@ skipping 720 matching lines @@
   is_monitoring_ = is_monitoring;
 #if !defined(OS_ANDROID)
   for (std::set<TracingUI*>::iterator it = tracing_uis_.begin();
        it != tracing_uis_.end(); it++) {
     (*it)->OnMonitoringStateChanged(is_monitoring);
   }
 #endif
 }
 
 }  // namespace content