Replace OStream with std::ostream.

src/compiler/basic-block-instrumentor.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/basic-block-instrumentor.h"
+
+#include <sstream>
+
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/operator-properties-inl.h"
 #include "src/compiler/schedule.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 29 matching lines @@
 BasicBlockProfiler::Data* BasicBlockInstrumentor::Instrument(
     CompilationInfo* info, Graph* graph, Schedule* schedule) {
   // Skip the exit block in profiles, since the register allocator can't handle
   // it and entry into it means falling off the end of the function anyway.
   size_t n_blocks = static_cast<size_t>(schedule->RpoBlockCount()) - 1;
   BasicBlockProfiler::Data* data =
       info->isolate()->GetOrCreateBasicBlockProfiler()->NewData(n_blocks);
   // Set the function name.
   if (!info->shared_info().is_null() &&
       info->shared_info()->name()->IsString()) {
-    OStringStream os;
+    std::ostringstream os;
     String::cast(info->shared_info()->name())->PrintUC16(os);
     data->SetFunctionName(&os);
   }
   // Capture the schedule string before instrumentation.
   {
-    OStringStream os;
+    std::ostringstream os;
     os << *schedule;
     data->SetSchedule(&os);
   }
   // Add the increment instructions to the start of every block.
   CommonOperatorBuilder common(graph->zone());
   Node* zero = graph->NewNode(common.Int32Constant(0));
   Node* one = graph->NewNode(common.Int32Constant(1));
   MachineOperatorBuilder machine;
   BasicBlockVector* blocks = schedule->rpo_order();
   size_t block_number = 0;
@@ skipping 21 matching lines @@
     for (int i = insertion_start; i < kArraySize; ++i) {
       schedule->SetBlockForNode(block, to_insert[i]);
     }
   }
   return data;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8