Add a Mojo MemoryDumpProvider.

mojo/edk/system/core.h

 // 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.
 
 #ifndef MOJO_EDK_SYSTEM_CORE_H_
 #define MOJO_EDK_SYSTEM_CORE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 281 matching lines @@
   base::Lock node_controller_lock_;
 
   // This is lazily initialized on first access. Always use GetNodeController()
   // to access it.
   std::unique_ptr<NodeController> node_controller_;
 
   // The default callback to invoke, if any, when a process error is reported
   // but cannot be associated with a specific process.
   ProcessErrorCallback default_process_error_callback_;
 
-  base::Lock handles_lock_;
   HandleTable handles_;
 
   base::Lock mapping_table_lock_;  // Protects |mapping_table_|.
   MappingTable mapping_table_;
 
   base::Lock property_lock_;
   // Properties that can be read using the MojoGetProperty() API.
   bool property_sync_call_allowed_ = true;
 
   DISALLOW_COPY_AND_ASSIGN(Core);
 };
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_CORE_H_