Deprecte LoweringBuilder in favor of Reducer.

src/compiler/simplified-lowering.h

Index: src/compiler/simplified-lowering.h
diff --git a/src/compiler/simplified-lowering.h b/src/compiler/simplified-lowering.h
index c85515d9447602803308e2a05de96c12be615de3..d08dc66edd65232a4820ea5b5603dec2ae4b976e 100644
--- a/src/compiler/simplified-lowering.h
+++ b/src/compiler/simplified-lowering.h
@@ -7,7 +7,6 @@
 
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/js-graph.h"
-#include "src/compiler/lowering-builder.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/simplified-operator.h"
@@ -16,18 +15,15 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-class SimplifiedLowering : public LoweringBuilder {
+class SimplifiedLowering : public Reducer {
  public:
-  explicit SimplifiedLowering(JSGraph* jsgraph,
-                              SourcePositionTable* source_positions)
-      : LoweringBuilder(jsgraph->graph(), source_positions),
-        jsgraph_(jsgraph),
-        machine_(jsgraph->zone()) {}
+  explicit SimplifiedLowering(JSGraph* jsgraph)
+      : jsgraph_(jsgraph), machine_(jsgraph->zone()) {}
   virtual ~SimplifiedLowering() {}
 
   void LowerAllNodes();
 
-  virtual void Lower(Node* node);
+  virtual Reduction Reduce(Node* node);
   void LowerChange(Node* node, Node* effect, Node* control);
 
   // TODO(titzer): These are exposed for direct testing. Use a friend class.