Revert of base: Remove use of MessageLoopProxy

net/disk_cache/simple/simple_entry_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 "net/disk_cache/simple/simple_entry_impl.h"
 
 #include <algorithm>
 #include <cstring>
 #include <vector>
 
@@ skipping 124 matching lines @@
   DCHECK(!completion_callback.is_null());
   if (!backend.get())
     return;
   completion_callback.Run(result);
 }
 
 }  // namespace
 
 using base::Closure;
 using base::FilePath;
+using base::MessageLoopProxy;
 using base::Time;
 using base::TaskRunner;
 
 // A helper class to insure that RunNextOperationIfNeeded() is called when
 // exiting the current stack frame.
 class SimpleEntryImpl::ScopedOperationRunner {
  public:
   explicit ScopedOperationRunner(SimpleEntryImpl* entry) : entry_(entry) {
   }
 
@@ skipping 1368 matching lines @@
     }
     crc32s_end_offset_[stream_index] = offset + length;
   } else if (offset < crc32s_end_offset_[stream_index]) {
     // If a range for which the crc32 was already computed is rewritten, the
     // computation of the crc32 need to start from 0 again.
     crc32s_end_offset_[stream_index] = 0;
   }
 }
 
 }  // namespace disk_cache