Don't use nonstandard %% dimension in unit tests

Source/core/animation/LengthStyleInterpolationTest.cpp

Index: Source/core/animation/LengthStyleInterpolationTest.cpp
diff --git a/Source/core/animation/LengthStyleInterpolationTest.cpp b/Source/core/animation/LengthStyleInterpolationTest.cpp
index 57cc574295baf5e7cfc295d05fc5029bf0630c3d..08c98ab318b11793c6f77f49794df8d784125d7a 100644
--- a/Source/core/animation/LengthStyleInterpolationTest.cpp
+++ b/Source/core/animation/LengthStyleInterpolationTest.cpp
@@ -113,7 +113,7 @@ TEST_F(AnimationLengthStyleInterpolationTest, MultipleUnits)
     initLengthArray(expectation);
     OwnPtrWillBeRawPtr<InterpolableList> list = createInterpolableLength(0, 10, 0, 10, 0, 10, 0, 10, 0, 10);
     toCSSPrimitiveValue(interpolableValueToLength(list.get(), ValueRangeAll).get())->accumulateLengthArray(expectation);
-    EXPECT_TRUE(lengthArraysEqual(expectation, setLengthArray(actual, "calc(10%% + 10ex + 10ch + 10vh + 10vmax)")));
+    EXPECT_TRUE(lengthArraysEqual(expectation, setLengthArray(actual, "calc(10% + 10ex + 10ch + 10vh + 10vmax)")));
 }
 
 }