Minor simplification and cleanup of graph builder.

src/compiler/graph-builder.h

Index: src/compiler/graph-builder.h
diff --git a/src/compiler/graph-builder.h b/src/compiler/graph-builder.h
index ac42f6e7f678e9fe93cca457a127d5710ff2e3b6..fc9000855429d1513700cfd54521d5ea98a8124c 100644
--- a/src/compiler/graph-builder.h
+++ b/src/compiler/graph-builder.h
@@ -109,7 +109,7 @@ class StructuredGraphBuilder : public GraphBuilder {
   virtual Node* MakeNode(Operator* op, int value_input_count,
                          Node** value_inputs);
 
-  Environment* environment_internal() const { return environment_; }
+  Environment* environment() const { return environment_; }
   void set_environment(Environment* env) { environment_ = env; }
 
   Node* current_context() const { return current_context_; }
@@ -135,12 +135,6 @@ class StructuredGraphBuilder : public GraphBuilder {
   // depends on the graph builder, but environments themselves are not virtual.
   virtual Environment* CopyEnvironment(Environment* env);
 
-  // Helper when creating node that depends on control.
-  Node* GetControlDependency();
-
-  // Helper when creating node that updates control.
-  void UpdateControlDependency(Node* new_control);
-
   // Helper to indicate a node exits the function body.
   void UpdateControlDependencyToLeaveFunction(Node* exit);