Add RetainedRef uses where needed.

content/browser/tracing/tracing_controller_browsertest.cc

 // 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.
 
 #include "content/public/browser/tracing_controller.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/files/file_util.h"
@@ skipping 62 matching lines @@
       const std::string& contents) override {
     EXPECT_EQ(trace_, contents);
 
     std::string tmp = contents;
     scoped_refptr<base::RefCountedString> chunk_ptr =
         base::RefCountedString::TakeString(&tmp);
 
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(done_callback_, base::Passed(std::move(metadata)),
-                   chunk_ptr));
+                   base::RetainedRef(chunk_ptr)));
   }
 
  protected:
   ~TracingControllerTestEndpoint() override {}
 
   std::string trace_;
   base::Callback<void(scoped_ptr<const base::DictionaryValue>,
                       base::RefCountedString*)> done_callback_;
 };
 
@@ skipping 360 matching lines @@
 
   TracingController* controller = TracingController::GetInstance();
   EXPECT_TRUE(controller->StartTracing(
       TraceConfig(),
       TracingController::StartTracingDoneCallback()));
   EXPECT_TRUE(controller->StopTracing(NULL));
   base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace content