Revert r160071 "Web Animations: Implement AnimationClock and fix start time of animations"

Source/core/animation/DocumentTimelineTest.cpp

Index: Source/core/animation/DocumentTimelineTest.cpp
diff --git a/Source/core/animation/DocumentTimelineTest.cpp b/Source/core/animation/DocumentTimelineTest.cpp
index eb40e00936077d681fceb09b6e063d6445e3dd21..203c53b2f41a06e58d9dd62d4499ee8684bd9a7e 100644
--- a/Source/core/animation/DocumentTimelineTest.cpp
+++ b/Source/core/animation/DocumentTimelineTest.cpp
@@ -32,7 +32,6 @@
 #include "core/animation/DocumentTimeline.h"
 
 #include "core/animation/Animation.h"
-#include "core/animation/AnimationClock.h"
 #include "core/animation/KeyframeAnimationEffect.h"
 #include "core/animation/TimedItem.h"
 #include "core/dom/Document.h"
@@ -53,7 +52,6 @@ protected:
         element = Element::create(nullQName() , document.get());
         timeline = DocumentTimeline::create(document.get());
         timeline->setZeroTimeAsPerfTime(0);
-        document->animationClock().updateTime(0);
         ASSERT_EQ(0, timeline->currentTime());
     }
 
@@ -89,7 +87,6 @@ TEST_F(CoreAnimationDocumentTimelineTest, ZeroTimeAsPerfTime)
     EXPECT_TRUE(isNull(timeline->currentTime()));
 
     timeline->setZeroTimeAsPerfTime(300);
-    document->animationClock().updateTime(300);
     timeline->serviceAnimations(300);
     EXPECT_EQ(0, timeline->currentTime());