Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/animation/PlayerTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 55 matching lines @@
     {
         timeline->setZeroTime(0);
         updateTimeline(0);
     }
 
     PassRefPtr<Animation> makeAnimation(double duration = 30, double playbackRate = 1)
     {
         Timing timing;
         timing.iterationDuration = duration;
         timing.playbackRate = playbackRate;
-        return Animation::create(0, 0, timing);
+        return Animation::create(nullptr, nullptr, timing);
     }
 
     bool updateTimeline(double time)
     {
         document->animationClock().updateTime(time);
         // The timeline does not know about our player, so we have to explicitly call update().
         return player->update();
     }
 
     RefPtr<Document> document;
@@ skipping 358 matching lines @@
     player->setPlaybackRate(0);
     player->finish(exceptionState);
     EXPECT_EQ(10, player->currentTime());
 }
 
 TEST_F(AnimationPlayerTest, FinishRaisesException)
 {
     Timing timing;
     timing.iterationDuration = 1;
     timing.iterationCount = std::numeric_limits<double>::infinity();
-    player->setSource(Animation::create(0, 0, timing).get());
+    player->setSource(Animation::create(nullptr, nullptr, timing).get());
     player->setCurrentTime(10);
 
     player->finish(exceptionState);
     EXPECT_EQ(10, player->currentTime());
     EXPECT_TRUE(exceptionState.hadException());
     EXPECT_EQ(InvalidStateError, exceptionState.code());
 }
 
 
 TEST_F(AnimationPlayerTest, LimitingAtSourceEnd)
@@ skipping 148 matching lines @@
     player->setSource(timedItem);
     EXPECT_EQ(0, player2->source());
 }
 
 TEST_F(AnimationPlayerTest, PlayersReturnTimeToNextEffect)
 {
     Timing timing;
     timing.startDelay = 1;
     timing.iterationDuration = 1;
     timing.endDelay = 1;
-    RefPtr<Animation> animation = Animation::create(0, 0, timing);
+    RefPtr<Animation> animation = Animation::create(nullptr, nullptr, timing);
     player = timeline->createPlayer(animation.get());
     player->setStartTime(0);
 
     updateTimeline(0);
     EXPECT_EQ(1, player->timeToEffectChange());
 
     updateTimeline(0.5);
     EXPECT_EQ(0.5, player->timeToEffectChange());
 
     updateTimeline(1);
@@ skipping 28 matching lines @@
     player->setPlaybackRate(-2);
     player->update();
     EXPECT_EQ(0.5, player->timeToEffectChange());
 }
 
 TEST_F(AnimationPlayerTest, AttachedPlayers)
 {
     RefPtr<Element> element = document->createElement("foo", ASSERT_NO_EXCEPTION);
 
     Timing timing;
-    RefPtr<Animation> animation = Animation::create(element, 0, timing);
+    RefPtr<Animation> animation = Animation::create(element, nullptr, timing);
     RefPtr<Player> player = timeline->createPlayer(animation.get());
     timeline->serviceAnimations();
     EXPECT_EQ(1U, element->activeAnimations()->players().find(player.get())->value);
 
     player.release();
     EXPECT_TRUE(element->activeAnimations()->players().isEmpty());
 }
 
 }