[compiler] Delete unused variable.

src/compiler/loop-variable-optimizer.h

 // Copyright 2016 the V8 project 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 V8_COMPILER_LOOP_VARIABLE_OPTIMIZER_H_
 #define V8_COMPILER_LOOP_VARIABLE_OPTIMIZER_H_
 
 #include "src/zone-containers.h"
 
 namespace v8 {
@@ skipping 27 matching lines @@
 
   InductionVariable(Node* phi, Node* arith, Node* increment, Node* init_value,
                     Zone* zone)
       : phi_(phi),
         arith_(arith),
         increment_(increment),
         init_value_(init_value),
         lower_bounds_(zone),
         upper_bounds_(zone) {}
 
-  void AddUpperBound(Node* bound, ConstraintKind kind, Zone* graph_zone);
-  void AddLowerBound(Node* bound, ConstraintKind kind, Zone* graph_zone);
+  void AddUpperBound(Node* bound, ConstraintKind kind);
+  void AddLowerBound(Node* bound, ConstraintKind kind);
 
   Node* phi_;
   Node* arith_;
   Node* increment_;
   Node* init_value_;
   ZoneVector<Bound> lower_bounds_;
   ZoneVector<Bound> upper_bounds_;
 };
 
 class LoopVariableOptimizer {
@@ skipping 43 matching lines @@
   Zone* zone_;
   ZoneMap<int, const VariableLimits*> limits_;
   ZoneMap<int, InductionVariable*> induction_vars_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_LOOP_VARIABLE_OPTIMIZER_H_