Polish Maybe API a bit, removing useless creativity and fixing some signatures.

src/ast.h

 // Copyright 2012 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_AST_H_
 #define V8_AST_H_
 
 #include "src/v8.h"
 
 #include "src/assembler.h"
@@ skipping 2055 matching lines @@
 
   // The short-circuit logical operations need an AST ID for their
   // right-hand subexpression.
   static int num_ids() { return parent_num_ids() + 2; }
   BailoutId RightId() const { return BailoutId(local_id(0)); }
 
   TypeFeedbackId BinaryOperationFeedbackId() const {
     return TypeFeedbackId(local_id(1));
   }
   Maybe<int> fixed_right_arg() const {
-    return has_fixed_right_arg_ ? Maybe<int>(fixed_right_arg_value_)
-                                : Maybe<int>();
+    return has_fixed_right_arg_ ? Just(fixed_right_arg_value_) : Nothing<int>();
   }
   void set_fixed_right_arg(Maybe<int> arg) {
     has_fixed_right_arg_ = arg.has_value;
     if (arg.has_value) fixed_right_arg_value_ = arg.value;
   }
 
   virtual void RecordToBooleanTypeFeedback(
       TypeFeedbackOracle* oracle) OVERRIDE;
 
  protected:
@@ skipping 1422 matching lines @@
 
  private:
   Zone* zone_;
   AstValueFactory* ast_value_factory_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_