Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/src/google/protobuf/compiler/objectivec/objectivec_map_field.h

Index: third_party/protobuf/src/google/protobuf/compiler/objectivec/objectivec_map_field.h
diff --git a/third_party/protobuf/src/google/protobuf/compiler/objectivec/objectivec_map_field.h b/third_party/protobuf/src/google/protobuf/compiler/objectivec/objectivec_map_field.h
index 173541f2073b55d8ebe7bb376fca6acec244a8f1..bc68a6829f04373fc5563691384aa42eff0cda34 100644
--- a/third_party/protobuf/src/google/protobuf/compiler/objectivec/objectivec_map_field.h
+++ b/third_party/protobuf/src/google/protobuf/compiler/objectivec/objectivec_map_field.h
@@ -41,18 +41,21 @@ namespace compiler {
 namespace objectivec {
 
 class MapFieldGenerator : public RepeatedFieldGenerator {
-  friend FieldGenerator* FieldGenerator::Make(const FieldDescriptor* field);
+  friend FieldGenerator* FieldGenerator::Make(const FieldDescriptor* field,
+                                              const Options& options);
 
  public:
   virtual void FinishInitialization(void);
-  virtual void GenerateFieldDescriptionTypeSpecific(io::Printer* printer) const;
 
  protected:
-  explicit MapFieldGenerator(const FieldDescriptor* descriptor);
+  MapFieldGenerator(const FieldDescriptor* descriptor, const Options& options);
   virtual ~MapFieldGenerator();
 
+  virtual void DetermineForwardDeclarations(set<string>* fwd_decls) const;
+
  private:
   scoped_ptr<FieldGenerator> value_field_generator_;
+
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapFieldGenerator);
 };