Remove some unused functions in core

Source/core/animation/animatable/AnimatableColorTest.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 47 matching lines @@
 
     EXPECT_EQ(AnimatableColorImpl(Color(0xFF001020)).interpolateTo(Color(0xFF4080C0), 3. / 16).toColor().rgb(), 0xFF0C253E);
 
     EXPECT_EQ(AnimatableColorImpl(Color(0x0000FF00)).interpolateTo(Color(0xFFFF00FF), 0.5).toColor().rgb(), 0x80FF00FF);
     EXPECT_EQ(AnimatableColorImpl(Color(0x4000FF00)).interpolateTo(Color(0x80FF00FF), 0.5).toColor().rgb(), 0x60AA55AAu);
     EXPECT_EQ(AnimatableColorImpl(Color(0x40FF00FF)).interpolateTo(Color(0x80FFFFFF), 0.5).toColor().rgb(), 0x60FFAAFFu);
 
     EXPECT_EQ(AnimatableColorImpl(Color(0x10204080)).interpolateTo(Color(0x104080C0), 0.5).toColor().rgb(), 0x103060A0u);
 }
 
-TEST(AnimationAnimatableColorTest, Distance)
-{
-    EXPECT_NEAR(1.0, AnimatableColorImpl(Color(0xFF000000)).distanceTo(Color(0xFFFF0000)), 0.00000001);
-    EXPECT_NEAR(13.0 / 255, AnimatableColorImpl(Color(0xFF53647C)).distanceTo(Color(0xFF506070)), 0.00000001);
-    EXPECT_NEAR(60.0 / 255, AnimatableColorImpl(Color(0x3C000000)).distanceTo(Color(0x00FFFFFF)), 0.00000001);
-    EXPECT_NEAR(60.0 / 255, AnimatableColorImpl(Color(0x3C000000)).distanceTo(Color(0x3C00FF00)), 0.00000001);
-
-    RefPtrWillBeRawPtr<AnimatableColor> first = AnimatableColor::create(AnimatableColorImpl(Color(0xFF53647C)), AnimatableColorImpl(Color(0xFF000000)));
-    RefPtrWillBeRawPtr<AnimatableColor> second = AnimatableColor::create(AnimatableColorImpl(Color(0xFF506070)), AnimatableColorImpl(Color(0xFF000000)));
-    EXPECT_NEAR(13.0 / 255, AnimatableValue::distance(first.get(), second.get()), 0.00000001);
 }
-
-}