Web Animations: Remove legacy animations engine.

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
diff --git a/Source/core/frame/FrameView.cpp b/Source/core/frame/FrameView.cpp
index bdf389b57a826b00a117b84a4c13cc2e586dbe12..d44ba7cffc89f4bcaba4859c8105d3b5fbf2dc25 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -40,7 +40,6 @@
 #include "core/fetch/ResourceLoadPriorityOptimizer.h"
 #include "core/frame/Frame.h"
 #include "core/frame/Settings.h"
-#include "core/frame/animation/AnimationController.h"
 #include "core/html/HTMLFrameElement.h"
 #include "core/html/HTMLPlugInElement.h"
 #include "core/html/parser/TextResourceDecoder.h"
@@ -1879,9 +1878,6 @@ void FrameView::serviceScriptedAnimations(double monotonicAnimationStartTime)
 {
     for (RefPtr<Frame> frame = m_frame; frame; frame = frame->tree().traverseNext()) {
         frame->view()->serviceScrollAnimations();
-        if (!RuntimeEnabledFeatures::webAnimationsCSSEnabled())
-            frame->animation().serviceAnimations();
-
         DocumentAnimations::serviceOnAnimationFrame(*frame->document(), monotonicAnimationStartTime);
     }