Replace OStream with std::ostream.

test/cctest/compiler/test-operator.cc

Index: test/cctest/compiler/test-operator.cc
diff --git a/test/cctest/compiler/test-operator.cc b/test/cctest/compiler/test-operator.cc
index af75d6766306a3bd0d64fc6ac475d6c67682bfc2..3df76e8b7cca2df13e7d1b1300e8413ec7277dd9 100644
--- a/test/cctest/compiler/test-operator.cc
+++ b/test/cctest/compiler/test-operator.cc
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <sstream>
+
 #include "src/v8.h"
 
 #include "src/compiler/operator.h"
@@ -11,7 +13,6 @@ using namespace v8::internal;
 using namespace v8::internal::compiler;
 
 #define NaN (v8::base::OS::nan_value())
-#define Infinity (std::numeric_limits<double>::infinity())
 
 TEST(TestOperatorMnemonic) {
   SimpleOperator op1(10, Operator::kNoProperties, 0, 0, "ThisOne");
@@ -67,9 +68,9 @@ TEST(TestSimpleOperatorEquals) {
 
 
 static SmartArrayPointer<const char> OperatorToString(Operator* op) {
-  OStringStream os;
+  std::ostringstream os;
   os << *op;
-  return SmartArrayPointer<const char>(StrDup(os.c_str()));
+  return SmartArrayPointer<const char>(StrDup(os.str().c_str()));
 }
 
 
@@ -236,9 +237,6 @@ TEST(TestOperator1doublePrint) {
   Operator1<double> op3(12, Operator::kNoProperties, 0, 1, "FooBar", 2e+123);
   CHECK_EQ("FooBar[2e+123]", OperatorToString(&op3).get());
 
-  Operator1<double> op4(12, Operator::kNoProperties, 0, 1, "BarFoo", Infinity);
-  CHECK_EQ("BarFoo[inf]", OperatorToString(&op4).get());
-
   Operator1<double> op5(12, Operator::kNoProperties, 0, 1, "BarFoo", NaN);
   CHECK_EQ("BarFoo[nan]", OperatorToString(&op5).get());
 }