Add StringBuilder::erase(index)

third_party/WebKit/Source/platform/wtf/text/StringBuilder.h

 /*
  * Copyright (C) 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 127 matching lines @@
   }
 
   void AppendNumber(int);
   void AppendNumber(unsigned);
   void AppendNumber(long);
   void AppendNumber(unsigned long);
   void AppendNumber(long long);
   void AppendNumber(unsigned long long);
   void AppendNumber(double, unsigned precision = 6);
 
+  void erase(unsigned);
+
   String ToString();
   AtomicString ToAtomicString();
   String Substring(unsigned start, unsigned length) const;
 
   unsigned length() const { return length_; }
   bool IsEmpty() const { return !length_; }
 
   unsigned Capacity() const;
   void ReserveCapacity(unsigned new_capacity);
 
@@ skipping 136 matching lines @@
 }
 inline bool operator!=(const String& a, const StringBuilder& b) {
   return !Equal(b, a);
 }
 
 }  // namespace WTF
 
 using WTF::StringBuilder;
 
 #endif  // StringBuilder_h