Replace OStream with std::ostream.

src/compiler/js-operator.h

 // Copyright 2013 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_COMPILER_JS_OPERATOR_H_
 #define V8_COMPILER_JS_OPERATOR_H_
 
 #include "src/compiler/linkage.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
@@ skipping 182 matching lines @@
 #undef BINOP
 #undef UNOP
 
  private:
   Zone* zone_;
 };
 
 // Specialization for static parameters of type {ContextAccess}.
 template <>
 struct StaticParameterTraits<ContextAccess> {
-  static OStream& PrintTo(OStream& os, ContextAccess val) {  // NOLINT
+  static std::ostream& PrintTo(std::ostream& os, ContextAccess val) {  // NOLINT
     return os << val.depth() << "," << val.index()
               << (val.immutable() ? ",imm" : "");
   }
   static int HashCode(ContextAccess val) {
     return (val.depth() << 16) | (val.index() & 0xffff);
   }
   static bool Equals(ContextAccess a, ContextAccess b) {
     return a.immutable() == b.immutable() && a.depth() == b.depth() &&
            a.index() == b.index();
   }
 };
 
 // Specialization for static parameters of type {Runtime::FunctionId}.
 template <>
 struct StaticParameterTraits<Runtime::FunctionId> {
-  static OStream& PrintTo(OStream& os, Runtime::FunctionId val) {  // NOLINT
+  static std::ostream& PrintTo(std::ostream& os,
+                               Runtime::FunctionId val) {  // NOLINT
     const Runtime::Function* f = Runtime::FunctionForId(val);
     return os << (f->name ? f->name : "?Runtime?");
   }
   static int HashCode(Runtime::FunctionId val) { return static_cast<int>(val); }
   static bool Equals(Runtime::FunctionId a, Runtime::FunctionId b) {
     return a == b;
   }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_OPERATOR_H_