[Sync] Rename to (Processor|Worker)EntityTracker for clarity.

The names ModelTypeEntity and EntityTracker did not express the purposes
and the similarities between the classes well. They are each essentially
internal to their respective components, and they each handle the logic
of tracking what's necessary for an entity in that component. I think
these names are much clearer.

Review URL: https://codereview.chromium.org/1739423002

Cr-Commit-Position: refs/heads/master@{#378348}

1 files changed, 7 insertions, 6 deletions

diff --git a/sync/internal_api/public/shared_model_type_processor.h b/sync/internal_api/public/shared_model_type_processor.h
index 7ca4572..db20870 100644
--- a/sync/internal_api/public/shared_model_type_processor.h
+++ b/sync/internal_api/public/shared_model_type_processor.h
@@ -27,7 +27,7 @@
 namespace syncer_v2 {
 struct ActivationContext;
 class CommitQueue;
-class ModelTypeEntity;
+class ProcessorEntityTracker;
 
 // A sync component embedded on the synced type's thread that helps to handle
 // communication between sync and model type threads.
@@ -87,7 +87,7 @@ class SYNC_EXPORT SharedModelTypeProcessor : public ModelTypeProcessor,
  private:
   friend class SharedModelTypeProcessorTest;
 
-  using EntityMap = std::map<std::string, scoped_ptr<ModelTypeEntity>>;
+  using EntityMap = std::map<std::string, scoped_ptr<ProcessorEntityTracker>>;
   using UpdateMap = std::map<std::string, scoped_ptr<UpdateResponseData>>;
 
   // Callback for ModelTypeService::GetData(). Used when we need to load data
@@ -108,17 +108,18 @@ class SYNC_EXPORT SharedModelTypeProcessor : public ModelTypeProcessor,
   std::string GetHashForTag(const std::string& tag);
 
   // Gets the entity for the given tag, or null if there isn't one.
-  ModelTypeEntity* GetEntityForTag(const std::string& tag);
+  ProcessorEntityTracker* GetEntityForTag(const std::string& tag);
 
   // Gets the entity for the given tag hash, or null if there isn't one.
-  ModelTypeEntity* GetEntityForTagHash(const std::string& tag_hash);
+  ProcessorEntityTracker* GetEntityForTagHash(const std::string& tag_hash);
 
   // Create an entity in the entity map for |tag| and return a pointer to it.
   // Requires that no entity for |tag| already exists in the map.
-  ModelTypeEntity* CreateEntity(const std::string& tag, const EntityData& data);
+  ProcessorEntityTracker* CreateEntity(const std::string& tag,
+                                       const EntityData& data);
 
   // Version of the above that generates a tag for |data|.
-  ModelTypeEntity* CreateEntity(const EntityData& data);
+  ProcessorEntityTracker* CreateEntity(const EntityData& data);
 
   syncer::ModelType type_;
   sync_pb::DataTypeState data_type_state_;