Revert "Move mojo edk into mojo/edk"

mojo/edk/system/mapping_table.h

-// 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.
-
-#ifndef MOJO_EDK_SYSTEM_MAPPING_TABLE_H_
-#define MOJO_EDK_SYSTEM_MAPPING_TABLE_H_
-
-#include <stdint.h>
-
-#include <vector>
-
-#include "base/containers/hash_tables.h"
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "mojo/edk/system/system_impl_export.h"
-#include "mojo/public/c/system/types.h"
-
-namespace mojo {
-
-namespace embedder {
-class PlatformSharedBufferMapping;
-}
-
-namespace system {
-
-class Core;
-
-// Test-only function (defined/used in embedder/test_embedder.cc). Declared here
-// so it can be friended.
-namespace internal {
-bool ShutdownCheckNoLeaks(Core*);
-}
-
-// This class provides the (global) table of memory mappings (owned by |Core|),
-// which maps mapping base addresses to |PlatformSharedBufferMapping|s.
-//
-// This class is NOT thread-safe; locking is left to |Core|.
-class MOJO_SYSTEM_IMPL_EXPORT MappingTable {
- public:
-  MappingTable();
-  ~MappingTable();
-
-  // Tries to add a mapping. (Takes ownership of the mapping in all cases; on
-  // failure, it will be destroyed.)
-  MojoResult AddMapping(
-      scoped_ptr<embedder::PlatformSharedBufferMapping> mapping);
-  MojoResult RemoveMapping(uintptr_t address);
-
- private:
-  friend bool internal::ShutdownCheckNoLeaks(Core*);
-
-  typedef base::hash_map<uintptr_t, embedder::PlatformSharedBufferMapping*>
-      AddressToMappingMap;
-  AddressToMappingMap address_to_mapping_map_;
-
-  DISALLOW_COPY_AND_ASSIGN(MappingTable);
-};
-
-}  // namespace system
-}  // namespace mojo
-
-#endif  // MOJO_EDK_SYSTEM_MAPPING_TABLE_H_