Remove unused code in InvalidatableInterpolation

third_party/WebKit/Source/core/animation/InterpolationEffectTest.cpp

Index: third_party/WebKit/Source/core/animation/InterpolationEffectTest.cpp
diff --git a/third_party/WebKit/Source/core/animation/InterpolationEffectTest.cpp b/third_party/WebKit/Source/core/animation/InterpolationEffectTest.cpp
index df2589377a9e912e3c76eaf8ddb2b420f4d2dc1e..070ff2b28bf38ddd0872e2cc9b4b5e724e6d8caa 100644
--- a/third_party/WebKit/Source/core/animation/InterpolationEffectTest.cpp
+++ b/third_party/WebKit/Source/core/animation/InterpolationEffectTest.cpp
@@ -14,7 +14,7 @@ namespace {
 
 class SampleInterpolation : public LegacyStyleInterpolation {
  public:
-  static PassRefPtr<Interpolation> create(
+  static PassRefPtr<LegacyStyleInterpolation> create(
       std::unique_ptr<InterpolableValue> start,
       std::unique_ptr<InterpolableValue> end) {
     return adoptRef(new SampleInterpolation(std::move(start), std::move(end)));
@@ -34,12 +34,15 @@ const double duration = 1.0;
 
 class AnimationInterpolationEffectTest : public ::testing::Test {
  protected:
-  InterpolableValue* interpolationValue(Interpolation& interpolation) {
+  InterpolableValue* interpolationValue(
+      LegacyStyleInterpolation& interpolation) {
     return interpolation.getCachedValueForTesting();
   }
 
   double getInterpolableNumber(PassRefPtr<Interpolation> value) {
-    return toInterpolableNumber(interpolationValue(*value.get()))->value();
+    LegacyStyleInterpolation& interpolation =
+        toLegacyStyleInterpolation(*value.get());
+    return toInterpolableNumber(interpolationValue(interpolation))->value();
   }
 };