Don't use nonstandard %% dimension in unit tests

Source/core/animation/LengthStyleInterpolationTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/animation/LengthStyleInterpolation.h"
 
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/StylePropertySet.h"
 
@@ skipping 95 matching lines @@
     value = interpolableValueToLength(lengthToInterpolableValue(value.get()).get(), ValueRangeNonNegative);
     testPrimitiveValue(value, 0, CSSPrimitiveValue::CSS_EMS);
 }
 
 TEST_F(AnimationLengthStyleInterpolationTest, MultipleUnits)
 {
     CSSLengthArray actual, expectation;
     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)")));
 }
 
 }