Assert that unit type conversion works in accumulateLengthArray

third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp

Index: third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp b/third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp
index d364936f11270b4efc42fa9a923e78daffdcfb23..f5a9ac9c966eb6c181ed3a777ad5c4ce97a4a2cf 100644
--- a/third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp
+++ b/third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp
@@ -440,10 +440,10 @@ void CSSPrimitiveValue::accumulateLengthArray(CSSLengthArray& lengthArray, CSSLe
     }
 
     LengthUnitType lengthType;
-    if (unitTypeToLengthUnitType(type(), lengthType)) {
-        lengthArray.at(lengthType) += m_value.num * conversionToCanonicalUnitsScaleFactor(type()) * multiplier;
-        lengthTypeArray.set(lengthType);
-    }
+    bool conversionSuccess = unitTypeToLengthUnitType(type(), lengthType);
+    ASSERT_UNUSED(conversionSuccess, conversionSuccess);
+    lengthArray.at(lengthType) += m_value.num * conversionToCanonicalUnitsScaleFactor(type()) * multiplier;
+    lengthTypeArray.set(lengthType);
 }
 
 void CSSPrimitiveValue::accumulateLengthArray(CSSLengthArray& lengthArray, double multiplier) const