[regexp] remove some dead code.

src/regexp/regexp-macro-assembler-tracer.h

 // Copyright 2008 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_REGEXP_REGEXP_MACRO_ASSEMBLER_TRACER_H_
 #define V8_REGEXP_REGEXP_MACRO_ASSEMBLER_TRACER_H_
 
 #include "src/regexp/regexp-macro-assembler.h"
 
 namespace v8 {
@@ skipping 33 matching lines @@
                                               uc16 minus,
                                               uc16 and_with,
                                               Label* on_not_equal);
   virtual void CheckCharacterInRange(uc16 from,
                                      uc16 to,
                                      Label* on_in_range);
   virtual void CheckCharacterNotInRange(uc16 from,
                                         uc16 to,
                                         Label* on_not_in_range);
   virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);
+  virtual void CheckPosition(int cp_offset, Label* on_outside_input);
   virtual bool CheckSpecialCharacterClass(uc16 type,
                                           Label* on_no_match);
   virtual void Fail();
   virtual Handle<HeapObject> GetCode(Handle<String> source);
   virtual void GoTo(Label* label);
   virtual void IfRegisterGE(int reg, int comparand, Label* if_ge);
   virtual void IfRegisterLT(int reg, int comparand, Label* if_lt);
   virtual void IfRegisterEqPos(int reg, Label* if_eq);
   virtual IrregexpImplementation Implementation();
   virtual void LoadCurrentCharacter(int cp_offset,
@@ skipping 16 matching lines @@
   virtual void WriteStackPointerToRegister(int reg);
 
  private:
   RegExpMacroAssembler* assembler_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_REGEXP_REGEXP_MACRO_ASSEMBLER_TRACER_H_