Add missing variable initialization in StyleCalcLength::toCSSValue().

third_party/WebKit/Source/core/css/cssom/StyleCalcLength.cpp

Index: third_party/WebKit/Source/core/css/cssom/StyleCalcLength.cpp
diff --git a/third_party/WebKit/Source/core/css/cssom/StyleCalcLength.cpp b/third_party/WebKit/Source/core/css/cssom/StyleCalcLength.cpp
index a66b6e73e95c21efc727343971b6e241b4b1ecf7..de71cd92dcf8f47a3c8afac6eef6df2824e74b85 100644
--- a/third_party/WebKit/Source/core/css/cssom/StyleCalcLength.cpp
+++ b/third_party/WebKit/Source/core/css/cssom/StyleCalcLength.cpp
@@ -127,7 +127,7 @@ LengthValue* StyleCalcLength::divideInternal(double x, ExceptionState& exception
 PassRefPtrWillBeRawPtr<CSSValue> StyleCalcLength::toCSSValue() const
 {
     // Create a CSS Calc Value, then put it into a CSSPrimitiveValue
-    RefPtrWillBeRawPtr<CSSCalcExpressionNode> node;
+    RefPtrWillBeRawPtr<CSSCalcExpressionNode> node = nullptr;
     for (unsigned i = 0; i < LengthUnit::Count; ++i) {
         LengthUnit lengthUnit = static_cast<LengthUnit>(i);
         if (!has(lengthUnit))