Change TraceDataEndPoint::ReceiveTraceChunk() to accept unique_ptr<string>

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 19 matching lines @@
 class TraceMessageFilter;
 class TracingUI;
 
 // An implementation of this interface is passed when constructing a
 // TraceDataSink, and receives chunks of the final trace data as it's being
 // constructed.
 // Methods may be called from any thread.
 class CONTENT_EXPORT TraceDataEndpoint
     : public base::RefCountedThreadSafe<TraceDataEndpoint> {
  public:
-  virtual void ReceiveTraceChunk(const std::string& chunk) {}
+  virtual void ReceiveTraceChunk(std::unique_ptr<std::string> chunk) {}
   virtual void ReceiveTraceFinalContents(
       std::unique_ptr<const base::DictionaryValue> metadata) {}
 
  protected:
   friend class base::RefCountedThreadSafe<TraceDataEndpoint>;
   virtual ~TraceDataEndpoint() {}
 };
 
 class TracingControllerImpl
     : public TracingController,
@@ skipping 204 matching lines @@
   scoped_refptr<TraceDataSink> trace_data_sink_;
   scoped_refptr<TraceDataSink> monitoring_data_sink_;
   std::unique_ptr<base::DictionaryValue> metadata_;
 
   DISALLOW_COPY_AND_ASSIGN(TracingControllerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TRACING_TRACING_CONTROLLER_IMPL_H_