Replace OStream with std::ostream.

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 97 matching lines @@
 // Forward declarations
 class AstConstructionVisitor;
 template<class> class AstNodeFactory;
 class AstVisitor;
 class Declaration;
 class Module;
 class BreakableStatement;
 class Expression;
 class IterationStatement;
 class MaterializedLiteral;
-class OStream;
 class Statement;
 class TargetCollector;
 class TypeFeedbackOracle;
 
 class RegExpAlternative;
 class RegExpAssertion;
 class RegExpAtom;
 class RegExpBackReference;
 class RegExpCapture;
 class RegExpCharacterClass;
@@ skipping 2477 matching lines @@
                              RegExpNode* on_success) = 0;
   virtual bool IsTextElement() { return false; }
   virtual bool IsAnchoredAtStart() { return false; }
   virtual bool IsAnchoredAtEnd() { return false; }
   virtual int min_match() = 0;
   virtual int max_match() = 0;
   // Returns the interval of registers used for captures within this
   // expression.
   virtual Interval CaptureRegisters() { return Interval::Empty(); }
   virtual void AppendToText(RegExpText* text, Zone* zone);
-  OStream& Print(OStream& os, Zone* zone);  // NOLINT
+  std::ostream& Print(std::ostream& os, Zone* zone);  // NOLINT
 #define MAKE_ASTYPE(Name)                                                  \
   virtual RegExp##Name* As##Name();                                        \
   virtual bool Is##Name();
   FOR_EACH_REG_EXP_TREE_TYPE(MAKE_ASTYPE)
 #undef MAKE_ASTYPE
 };
 
 
 class RegExpDisjunction FINAL : public RegExpTree {
  public:
@@ skipping 909 matching lines @@
   Zone* zone_;
   Visitor visitor_;
   AstValueFactory* ast_value_factory_;
   AstNode::IdGen* id_gen_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_