Port more uses of OwnPtr to std::unique_ptr

sky/engine/bindings/builtin_natives.cc

 // Copyright 2014 The Chromium 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 "sky/engine/bindings/builtin_natives.h"
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ skipping 192 matching lines @@
   DART_CHECK_VALID(Dart_GetNativeIntegerArgument(args, 0, &milliseconds));
   Dart_Handle closure = Dart_GetNativeArgument(args, 1);
   DART_CHECK_VALID(closure);
   CHECK(Dart_IsClosure(closure));
   bool repeating = false;
   DART_CHECK_VALID(Dart_GetNativeBooleanArgument(args, 2, &repeating));
 
   DartState* state = DartState::Current();
   CHECK(state);
 
-  OwnPtr<DartTimerHeap::Task> task = adoptPtr(new DartTimerHeap::Task);
+  std::unique_ptr<DartTimerHeap::Task> task =
+      std::unique_ptr<DartTimerHeap::Task>(new DartTimerHeap::Task);
   task->closure.Set(state, closure);
   task->delay = base::TimeDelta::FromMilliseconds(milliseconds);
   task->repeating = repeating;
 
-  int timer_id = state->timer_heap().Add(task.release());
+  int timer_id = state->timer_heap().Add(std::move(task));
   Dart_SetIntegerReturnValue(args, timer_id);
 }
 
 void Timer_cancel(Dart_NativeArguments args) {
   int64_t timer_id = 0;
   DART_CHECK_VALID(Dart_GetNativeIntegerArgument(args, 0, &timer_id));
 
   DartState* state = DartState::Current();
   CHECK(state);
   state->timer_heap().Remove(timer_id);
 }
 
 }  // namespace blink