Revert "Web Animations: Introduce String based KeyframeEffectModel"

Source/core/core.gypi

Index: Source/core/core.gypi
diff --git a/Source/core/core.gypi b/Source/core/core.gypi
index b382e42d64e6376b58b79b444d27013e0e148c06..9b9b0211c305bca63f8c6cf0bec8a4a9416a43bf 100644
--- a/Source/core/core.gypi
+++ b/Source/core/core.gypi
@@ -611,8 +611,6 @@
             'animation/AnimatableUnknown.h',
             'animation/AnimatableValue.cpp',
             'animation/AnimatableValue.h',
-            'animation/AnimatableValueKeyframe.cpp',
-            'animation/AnimatableValueKeyframe.h',
             'animation/AnimatableVisibility.cpp',
             'animation/AnimatableVisibility.h',
             'animation/Animation.cpp',
@@ -621,8 +619,6 @@
             'animation/AnimationClock.h',
             'animation/AnimationEffect.h',
             'animation/AnimationHelpers.h',
-            'animation/AnimationPlayer.cpp',
-            'animation/AnimationPlayer.h',
             'animation/AnimationStack.cpp',
             'animation/AnimationStack.h',
             'animation/AnimationTranslationUtil.cpp',
@@ -648,8 +644,8 @@
             'animation/InterpolationEffect.h',
             'animation/KeyframeEffectModel.cpp',
             'animation/KeyframeEffectModel.h',
-            'animation/StringKeyframe.cp',
-            'animation/StringKeyframe.h',
+            'animation/AnimationPlayer.cpp',
+            'animation/AnimationPlayer.h',
             'animation/TimedItem.cpp',
             'animation/TimedItem.h',
             'animation/TimedItemCalculations.h',