Remove implicit conversions from scoped_refptr to T* in c/b/chromeos/file*

chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.cc

 // Copyright 2014 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 "chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.h"
 
 #include "base/debug/trace_event.h"
 #include "base/files/file.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.h"
@@ skipping 78 matching lines @@
       BrowserThread::PostTask(
           BrowserThread::IO,
           FROM_HERE,
           base::Bind(
               callback, 0, false /* has_more */, base::File::FILE_ERROR_ABORT));
       return;
     }
 
     abort_callback_ = file_system_->ReadFile(
         file_handle_,
-        buffer,
+        buffer.get(),
         offset,
         length,
         base::Bind(
             &OperationRunner::OnReadFileCompletedOnUIThread, this, callback));
   }
 
   // Requests metadata of a file. In case of either succes or a failure,
   // |callback| is executed. Must be called on UI thread.
   void GetMetadataOnUIThread(
       const ProvidedFileSystemInterface::GetMetadataCallback& callback) {
@@ skipping 377 matching lines @@
     callback.Run(net::ERR_UPLOAD_FILE_CHANGED);
     return;
   }
 
   DCHECK_EQ(base::File::FILE_OK, result);
   callback.Run(metadata->size);
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos