sync: Introduce classes for per-type counters

sync/engine/directory_type_debug_info_emitter.h

Index: sync/engine/directory_type_debug_info_emitter.h
diff --git a/sync/engine/directory_type_debug_info_emitter.h b/sync/engine/directory_type_debug_info_emitter.h
deleted file mode 100644
index d2247ddf5daada84834b9730da9de495505b6dc2..0000000000000000000000000000000000000000
--- a/sync/engine/directory_type_debug_info_emitter.h
+++ /dev/null
@@ -1,34 +0,0 @@
-// 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 SYNC_ENGINE_DIRECTORY_TYPE_DEBUG_INFO_EMITTER_H_
-#define SYNC_ENGINE_DIRECTORY_TYPE_DEBUG_INFO_EMITTER_H_
-
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/values.h"
-#include "sync/syncable/directory.h"
-
-namespace syncer {
-
-// Supports debugging requests for a certain directory type.
-class DirectoryTypeDebugInfoEmitter {
- public:
-  DirectoryTypeDebugInfoEmitter(syncable::Directory* directory,
-                                syncer::ModelType type);
-  virtual ~DirectoryTypeDebugInfoEmitter();
-
-  // Returns a ListValue representation of all known nodes of this type.
-  scoped_ptr<base::ListValue> GetAllNodes();
-
- private:
-  syncable::Directory* directory_;
-  ModelType type_;
-
-  DISALLOW_COPY_AND_ASSIGN(DirectoryTypeDebugInfoEmitter);
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_ENGINE_DIRECTORY_TYPE_DEBUG_INFO_EMITTER_H_