Remove some unused functions in core

Source/core/animation/animatable/AnimatableColor.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 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #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 {
 
 AnimatableColorImpl::AnimatableColorImpl(float red, float green, float blue, float alpha)
     : m_alpha(clampTo(alpha, 0.0f, 1.0f))
     , m_red(clampTo(red, 0.0f, 1.0f))
     , m_green(clampTo(green, 0.0f, 1.0f))
     , m_blue(clampTo(blue, 0.0f, 1.0f))
 {
 }
@@ skipping 22 matching lines @@
 }
 
 bool AnimatableColorImpl::operator==(const AnimatableColorImpl& other) const
 {
     return m_red == other.m_red
         && m_green == other.m_green
         && m_blue == other.m_blue
         && 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));
 }
 
 PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableColor::interpolateTo(const AnimatableValue* value, double fraction) const
 {
     const AnimatableColor* color = toAnimatableColor(value);
     return create(m_color.interpolateTo(color->m_color, fraction),
         m_visitedLinkColor.interpolateTo(color->m_visitedLinkColor, fraction));
 }
 
 bool AnimatableColor::equalTo(const AnimatableValue* value) const
 {
     const AnimatableColor* color = toAnimatableColor(value);
     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