Add back references. Since "back references" is two words...

src/ast.h

 // Copyright 2006-2008 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 1394 matching lines @@
   virtual RegExpLookahead* AsLookahead();
   virtual bool IsLookahead();
   RegExpTree* body() { return body_; }
   bool is_positive() { return is_positive_; }
  private:
   RegExpTree* body_;
   bool is_positive_;
 };
 
 
-class RegExpBackreference: public RegExpTree {
+class RegExpBackReference: public RegExpTree {
  public:
-  explicit RegExpBackreference(RegExpCapture* capture)
+  explicit RegExpBackReference(RegExpCapture* capture)
     : capture_(capture) { }
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success,
                              RegExpNode* on_failure);
-  virtual RegExpBackreference* AsBackreference();
-  virtual bool IsBackreference();
+  virtual RegExpBackReference* AsBackReference();
+  virtual bool IsBackReference();
   int index() { return capture_->index(); }
   RegExpCapture* capture() { return capture_; }
  private:
   RegExpCapture* capture_;
 };
 
 
 class RegExpEmpty: public RegExpTree {
  public:
   RegExpEmpty() { }
@@ skipping 57 matching lines @@
 #undef DEF_VISIT
 
  private:
   bool stack_overflow_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_