Make flex-grow and flex-shrink interpolation continuous with 0

Source/core/animation/animatable/AnimatableDouble.cpp

Index: Source/core/animation/animatable/AnimatableDouble.cpp
diff --git a/Source/core/animation/animatable/AnimatableDouble.cpp b/Source/core/animation/animatable/AnimatableDouble.cpp
index 225726fa49435ad201276a83b487d661322bbd2a..f122d44aee2182782dc6e49995b98c45b3ae4a22 100644
--- a/Source/core/animation/animatable/AnimatableDouble.cpp
+++ b/Source/core/animation/animatable/AnimatableDouble.cpp
@@ -36,18 +36,9 @@
 
 namespace blink {
 
-bool AnimatableDouble::usesDefaultInterpolationWith(const AnimatableValue* value) const
-{
-    const AnimatableDouble* other = toAnimatableDouble(value);
-    return (m_constraint == InterpolationIsNonContinuousWithZero) && (!m_number || !other->m_number);
-}
-
 PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableDouble::interpolateTo(const AnimatableValue* value, double fraction) const
 {
     const AnimatableDouble* other = toAnimatableDouble(value);
-    ASSERT(m_constraint == other->m_constraint);
-    if ((m_constraint == InterpolationIsNonContinuousWithZero) && (!m_number || !other->m_number))
-        return defaultInterpolateTo(this, value, fraction);
     return AnimatableDouble::create(blend(m_number, other->m_number, fraction));
 }