[Sync] Replace typedef with using.

components/sync/syncable/entry_kernel.h

 // Copyright 2012 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 COMPONENTS_SYNC_SYNCABLE_ENTRY_KERNEL_H_
 #define COMPONENTS_SYNC_SYNCABLE_ENTRY_KERNEL_H_
 
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 177 matching lines @@
   // and was therefore in the middle of a commit operation.
   // Note: must only be set if SYNCING is true.
   DIRTY_SYNC,
   BIT_TEMPS_END,
 };
 
 enum { BIT_TEMPS_COUNT = BIT_TEMPS_END - BIT_TEMPS_BEGIN };
 
 struct EntryKernel {
  private:
-  typedef ProtoValuePtr<sync_pb::EntitySpecifics> EntitySpecificsPtr;
-  typedef ProtoValuePtr<sync_pb::AttachmentMetadata> AttachmentMetadataPtr;
+  using EntitySpecificsPtr = ProtoValuePtr<sync_pb::EntitySpecifics>;
+  using AttachmentMetadataPtr = ProtoValuePtr<sync_pb::AttachmentMetadata>;
 
   std::string string_fields[STRING_FIELDS_COUNT];
   EntitySpecificsPtr specifics_fields[PROTO_FIELDS_COUNT];
   int64_t int64_fields[INT64_FIELDS_COUNT];
   base::Time time_fields[TIME_FIELDS_COUNT];
   Id id_fields[ID_FIELDS_COUNT];
   UniquePosition unique_position_fields[UNIQUE_POSITION_FIELDS_COUNT];
   AttachmentMetadataPtr
       attachment_metadata_fields[ATTACHMENT_METADATA_FIELDS_COUNT];
   std::bitset<BIT_FIELDS_COUNT> bit_fields;
@@ skipping 178 matching lines @@
 };
 
 template <typename T>
 class EntryKernelLessByMetaHandle {
  public:
   inline bool operator()(T a, T b) const {
     return a->ref(META_HANDLE) < b->ref(META_HANDLE);
   }
 };
 
-typedef std::set<const EntryKernel*,
-                 EntryKernelLessByMetaHandle<const EntryKernel*>>
-    EntryKernelSet;
+using EntryKernelSet =
+    std::set<const EntryKernel*,
+             EntryKernelLessByMetaHandle<const EntryKernel*>>;
 
-typedef std::set<
-    std::unique_ptr<EntryKernel>,
-    EntryKernelLessByMetaHandle<const std::unique_ptr<EntryKernel>&>>
-    OwnedEntryKernelSet;
+using OwnedEntryKernelSet =
+    std::set<std::unique_ptr<EntryKernel>,
+             EntryKernelLessByMetaHandle<const std::unique_ptr<EntryKernel>&>>;
 
 struct EntryKernelMutation {
   EntryKernel original, mutated;
 };
 
-typedef std::map<int64_t, EntryKernelMutation> EntryKernelMutationMap;
+using EntryKernelMutationMap = std::map<int64_t, EntryKernelMutation>;
 
-typedef Immutable<EntryKernelMutationMap> ImmutableEntryKernelMutationMap;
+using ImmutableEntryKernelMutationMap = Immutable<EntryKernelMutationMap>;
 
 std::unique_ptr<base::DictionaryValue> EntryKernelMutationToValue(
     const EntryKernelMutation& mutation);
 
 std::unique_ptr<base::ListValue> EntryKernelMutationMapToValue(
     const EntryKernelMutationMap& mutations);
 
 std::ostream& operator<<(std::ostream& os, const EntryKernel& entry_kernel);
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_SYNCABLE_ENTRY_KERNEL_H_