Fix number handling in accumulatePixelsAndPercent.

Source/core/css/parser/CSSPropertyParser.cpp

Index: Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/Source/core/css/parser/CSSPropertyParser.cpp b/Source/core/css/parser/CSSPropertyParser.cpp
index 165e2fae20692bdad55995ee43b2dfad5aa252c7..4c07dc937ff62549dbaa65a3c2c50ef080f2b713 100644
--- a/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/Source/core/css/parser/CSSPropertyParser.cpp
@@ -4684,6 +4684,10 @@ bool CSSPropertyParser::parseLineHeight(bool important)
         validPrimitive = true;
     else
         validPrimitive = (!id && validUnit(value, FNumber | FLength | FPercent | FNonNeg));
+    // The line-height property can accept both percents and numbers but additive opertaions are
+    // not permitted on them in calc() expressions.
+    if (m_parsedCalculation && m_parsedCalculation->category() == CalcPercentNumber)
+        validPrimitive = false;

[alancutter (OOO until 2018), 2014/12/31 03:38:08]

You should release() m_parsedCalulation here if it's no longer going to be
consumed by parseValidPrimitive().

     if (validPrimitive && (!m_valueList->next() || inShorthand()))
         addProperty(CSSPropertyLineHeight, parseValidPrimitive(id, value), important);
     return validPrimitive;