Revert of Use element id's for animations

third_party/WebKit/Source/core/animation/Animation.cpp

Index: third_party/WebKit/Source/core/animation/Animation.cpp
diff --git a/third_party/WebKit/Source/core/animation/Animation.cpp b/third_party/WebKit/Source/core/animation/Animation.cpp
index 604c16bfd893e5be300256b3b0f552607a6846b4..47698978a4961ac229d87eda6788ff8acddf2c6b 100644
--- a/third_party/WebKit/Source/core/animation/Animation.cpp
+++ b/third_party/WebKit/Source/core/animation/Animation.cpp
@@ -949,13 +949,14 @@
     ASSERT(m_content);
     ASSERT(m_content->isKeyframeEffect());
 
-    toKeyframeEffect(m_content.get())->attachCompositedLayers();
+    if (toKeyframeEffect(m_content.get())->canAttachCompositedLayers())
+        toKeyframeEffect(m_content.get())->attachCompositedLayers();
 }
 
 void Animation::detachCompositedLayers()
 {
-    if (m_compositorPlayer && m_compositorPlayer->isElementAttached())
-        m_compositorPlayer->detachElement();
+    if (m_compositorPlayer && m_compositorPlayer->isLayerAttached())
+        m_compositorPlayer->detachLayer();
 }
 
 void Animation::notifyAnimationStarted(double monotonicTime, int group)