Replace OStream with std::ostream.

src/compiler/arm/instruction-selector-arm-unittest.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/compiler/instruction-selector-unittest.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 1186 matching lines @@
   MachineType type;
   ArchOpcode ldr_opcode;
   ArchOpcode str_opcode;
   bool (InstructionSelectorTest::Stream::*val_predicate)(
       const InstructionOperand*) const;
   const int32_t immediates[40];
 };
 
 
 std::ostream& operator<<(std::ostream& os, const MemoryAccess& memacc) {
-  OStringStream ost;
-  ost << memacc.type;
-  return os << ost.c_str();
+  return os << memacc.type;
 }
 
 
 static const MemoryAccess kMemoryAccesses[] = {
     {kMachInt8,
      kArmLdrsb,
      kArmStrb,
      &InstructionSelectorTest::Stream::IsInteger,
      {-4095, -3340, -3231, -3224, -3088, -1758, -1203, -123, -117, -91, -89,
       -87, -86, -82, -44, -23, -3, 0, 7, 10, 39, 52, 69, 71, 91, 92, 107, 109,
@@ skipping 698 matching lines @@
       ASSERT_EQ(3U, s[0]->InputCount());
       EXPECT_EQ(lsb, s.ToInt32(s[0]->InputAt(1)));
       EXPECT_EQ(width, s.ToInt32(s[0]->InputAt(2)));
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8