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

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

 // Copyright 2016 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 "core/css/cssom/StyleCalcLength.h"
 
 #include "core/css/CSSCalculationValue.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/cssom/CalcDictionary.h"
 #include "core/css/cssom/SimpleLength.h"
@@ skipping 109 matching lines @@
         if (has(lengthUnit)) {
             result->set(m_values[i] / x, lengthUnit);
         }
     }
     return result;
 }
 
 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))
             continue;
         double value = get(lengthUnit);
         CSSPrimitiveValue::UnitType primitiveUnit = lengthTypeToPrimitiveType(lengthUnit);
         if (node) {
             node = CSSCalcValue::createExpressionNode(
                 node,
                 CSSCalcValue::createExpressionNode(CSSPrimitiveValue::create(std::abs(value), primitiveUnit)),
                 value >= 0 ? CalcAdd : CalcSubtract);
         } else {
             node = CSSCalcValue::createExpressionNode(CSSPrimitiveValue::create(value, primitiveUnit));
         }
     }
     return CSSPrimitiveValue::create(CSSCalcValue::create(node));
 }
 
 } // namespace blink