Remove some dead code.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 7936 matching lines @@
 // not always desirable, however (esp. in debugging situations).
 class StringInputBuffer: public unibrow::InputBuffer<String, String*, 1024> {
  public:
   virtual void Seek(unsigned pos);
   inline StringInputBuffer(): unibrow::InputBuffer<String, String*, 1024>() {}
   explicit inline StringInputBuffer(String* backing):
       unibrow::InputBuffer<String, String*, 1024>(backing) {}
 };
 
 
-class SafeStringInputBuffer
-  : public unibrow::InputBuffer<String, String**, 256> {
- public:
-  virtual void Seek(unsigned pos);
-  inline SafeStringInputBuffer()
-      : unibrow::InputBuffer<String, String**, 256>() {}
-  explicit inline SafeStringInputBuffer(String** backing)
-      : unibrow::InputBuffer<String, String**, 256>(backing) {}
-};
-
-
 template <typename T>
 class VectorIterator {
  public:
   VectorIterator(T* d, int l) : data_(Vector<const T>(d, l)), index_(0) { }
   explicit VectorIterator(Vector<const T> data) : data_(data), index_(0) { }
   T GetNext() { return data_[index_++]; }
   bool has_more() { return index_ < data_.length(); }
  private:
   Vector<const T> data_;
   int index_;
@@ skipping 1029 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_