Change first() and second() in CSSPairValue to return const references

Source/core/animation/LengthPairStyleInterpolationTest.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/LengthPairStyleInterpolation.h"
 
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSValue.h"
 #include "core/css/CSSValuePair.h"
@@ skipping 17 matching lines @@
     }
 
     static PassRefPtrWillBeRawPtr<CSSValue> roundTrip(PassRefPtrWillBeRawPtr<CSSValue> value, InterpolationRange range)
     {
         return interpolableValueToLengthPair(lengthPairToInterpolableValue(*value).get(), range);
     }
 
     static void testPrimitiveValue(RefPtrWillBeRawPtr<CSSValue> value, double first, double second, CSSPrimitiveValue::UnitType unitType)
     {
         EXPECT_TRUE(value->isValuePair());
+        const CSSValuePair& pair = toCSSValuePair(*value);
 
-        CSSValuePair* pair = toCSSValuePair(value.get());
-        ASSERT_TRUE(pair);
+        EXPECT_EQ(toCSSPrimitiveValue(pair.first()).getDoubleValue(), first);
+        EXPECT_EQ(toCSSPrimitiveValue(pair.second()).getDoubleValue(), second);
 
-        EXPECT_EQ(toCSSPrimitiveValue(pair->first())->getDoubleValue(), first);
-        EXPECT_EQ(toCSSPrimitiveValue(pair->second())->getDoubleValue(), second);
-
-        EXPECT_EQ(toCSSPrimitiveValue(pair->first())->typeWithCalcResolved(), unitType);
-        EXPECT_EQ(toCSSPrimitiveValue(pair->second())->typeWithCalcResolved(), unitType);
+        EXPECT_EQ(toCSSPrimitiveValue(pair.first()).typeWithCalcResolved(), unitType);
+        EXPECT_EQ(toCSSPrimitiveValue(pair.second()).typeWithCalcResolved(), unitType);
     }
 };
 
 TEST_F(LengthPairStyleInterpolationTest, ZeroTest)
 {
     RefPtrWillBeRawPtr<CSSPrimitiveValue> firstPx = CSSPrimitiveValue::create(0, CSSPrimitiveValue::UnitType::Pixels);
     RefPtrWillBeRawPtr<CSSPrimitiveValue> secondPx = CSSPrimitiveValue::create(0, CSSPrimitiveValue::UnitType::Pixels);
     RefPtrWillBeRawPtr<CSSValuePair> pairPx = CSSValuePair::create(firstPx.release(), secondPx.release(), CSSValuePair::KeepIdenticalValues);
     RefPtrWillBeRawPtr<CSSValue> value1 = roundTrip(pairPx.release(), RangeNonNegative);
     testPrimitiveValue(value1, 0, 0, CSSPrimitiveValue::UnitType::Pixels);
@@ skipping 26 matching lines @@
     testPrimitiveValue(value5, 10, 20, CSSPrimitiveValue::UnitType::Pixels);
 
     RefPtrWillBeRawPtr<CSSPrimitiveValue> firstPc = CSSPrimitiveValue::create(30, CSSPrimitiveValue::UnitType::Percentage);
     RefPtrWillBeRawPtr<CSSPrimitiveValue> secondPc = CSSPrimitiveValue::create(-30, CSSPrimitiveValue::UnitType::Percentage);
     RefPtrWillBeRawPtr<CSSValuePair> pairPc = CSSValuePair::create(firstPc.release(), secondPc.release(), CSSValuePair::KeepIdenticalValues);
     RefPtrWillBeRawPtr<CSSValue> value6 = roundTrip(pairPc.release(), RangeNonNegative);
     testPrimitiveValue(value6, 30, 0, CSSPrimitiveValue::UnitType::Percentage);
 }
 
 }