Remove some unused functions in core

Source/core/animation/animatable/AnimatableColor.cpp

Index: Source/core/animation/animatable/AnimatableColor.cpp
diff --git a/Source/core/animation/animatable/AnimatableColor.cpp b/Source/core/animation/animatable/AnimatableColor.cpp
index 51361568dc1b9cd56b8176e6c2c3d5c3ed147e73..337fe3c96dc09bcdb403bd4a424079ddb1fe75f3 100644
--- a/Source/core/animation/animatable/AnimatableColor.cpp
+++ b/Source/core/animation/animatable/AnimatableColor.cpp
@@ -32,16 +32,6 @@
 #include "core/animation/animatable/AnimatableColor.h"
 
 #include "platform/animation/AnimationUtilities.h"
-#include "wtf/MathExtras.h"
-
-namespace {
-
-double square(double x)
-{
-    return x * x;
-}
-
-} // namespace
 
 namespace blink {
 
@@ -84,14 +74,6 @@ bool AnimatableColorImpl::operator==(const AnimatableColorImpl& other) const
         && m_alpha == other.m_alpha;
 }
 
-double AnimatableColorImpl::distanceTo(const AnimatableColorImpl& other) const
-{
-    return sqrt(square(m_red - other.m_red)
-        + square(m_green - other.m_green)
-        + square(m_blue - other.m_blue)
-        + square(m_alpha - other.m_alpha));
-}
-
 PassRefPtrWillBeRawPtr<AnimatableColor> AnimatableColor::create(const AnimatableColorImpl& color, const AnimatableColorImpl& visitedLinkColor)
 {
     return adoptRefWillBeNoop(new AnimatableColor(color, visitedLinkColor));
@@ -110,10 +92,4 @@ bool AnimatableColor::equalTo(const AnimatableValue* value) const
     return m_color == color->m_color && m_visitedLinkColor == color->m_visitedLinkColor;
 }
 
-double AnimatableColor::distanceTo(const AnimatableValue* value) const
-{
-    const AnimatableColor* color = toAnimatableColor(value);
-    return m_color.distanceTo(color->m_color);
-}
-
 } // namespace blink