Move CSSCalcExpressionNode and subclasses to the oilpan heap.

Source/core/css/CSSCalculationValueTest.cpp

Index: Source/core/css/CSSCalculationValueTest.cpp
diff --git a/Source/core/css/CSSCalculationValueTest.cpp b/Source/core/css/CSSCalculationValueTest.cpp
index 471ecda61e9f4d709729a2c0d908e41c2f7382e6..31a5960e2d29b0e1d68acba8b653fe6461060882 100644
--- a/Source/core/css/CSSCalculationValueTest.cpp
+++ b/Source/core/css/CSSCalculationValueTest.cpp
@@ -42,7 +42,7 @@ using namespace WebCore;
 
 namespace {
 
-void testExpression(PassRefPtr<CSSCalcExpressionNode> expression, const RenderStyle* style)
+void testExpression(PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> expression, const RenderStyle* style)
 {
     EXPECT_TRUE(
         expression->equals(
@@ -54,8 +54,8 @@ void testExpression(PassRefPtr<CSSCalcExpressionNode> expression, const RenderSt
 TEST(CSSCalculationValue, CreateExpressionNodeFromLength)
 {
     RefPtr<RenderStyle> style = RenderStyle::create();
-    RefPtr<CSSCalcExpressionNode> expected;
-    RefPtr<CSSCalcExpressionNode> actual;
+    RefPtrWillBeRawPtr<CSSCalcExpressionNode> expected;
+    RefPtrWillBeRawPtr<CSSCalcExpressionNode> actual;
 
     expected = CSSCalcValue::createExpressionNode(CSSPrimitiveValue::create(10, CSSPrimitiveValue::CSS_PX), true);
     actual = CSSCalcValue::createExpressionNode(Length(10, WebCore::Fixed), style->effectiveZoom());
@@ -109,7 +109,7 @@ TEST(CSSCalculationValue, CreateExpressionNodeFromLength)
 
 TEST(CSSCalculationValue, CreateExpressionNodeFromLengthFromExpressionNode)
 {
-    RefPtr<CSSCalcExpressionNode> expression;
+    RefPtrWillBeRawPtr<CSSCalcExpressionNode> expression;
     RefPtr<RenderStyle> style = RenderStyle::createDefaultStyle();
     style->setEffectiveZoom(5);