Replace OStream with std::ostream.

src/property.cc

 // Copyright 2014 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.
 
 #include "src/property.h"
 
 #include "src/handles-inl.h"
 #include "src/ostreams.h"
 
 namespace v8 {
 namespace internal {
 
 void LookupResult::Iterate(ObjectVisitor* visitor) {
   LookupResult* current = this;  // Could be NULL.
   while (current != NULL) {
     visitor->VisitPointer(bit_cast<Object**>(&current->holder_));
     visitor->VisitPointer(bit_cast<Object**>(&current->transition_));
     current = current->next_;
   }
 }
 
 
-OStream& operator<<(OStream& os, const LookupResult& r) {
+std::ostream& operator<<(std::ostream& os, const LookupResult& r) {
   if (!r.IsFound()) return os << "Not Found\n";
 
   os << "LookupResult:\n";
   if (r.IsTransition()) {
     os << " -transition target:\n" << Brief(r.GetTransitionTarget()) << "\n";
   }
   return os;
 }
 
 
-OStream& operator<<(OStream& os, const Descriptor& d) {
+std::ostream& operator<<(std::ostream& os, const Descriptor& d) {
   return os << "Descriptor " << Brief(*d.GetKey()) << " @ "
             << Brief(*d.GetValue());
 }
 
 } }  // namespace v8::internal