Fix non-<number> calcs being accepted as numbers

third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
index 6b4eaaf96176859afddd7c97474e4519db5b7546..854cf317e36d5e84bd21cfd8b9e1524bdfe4b85a 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
@@ -184,7 +184,7 @@ public:
 
     bool consumeNumberRaw(double& result)
     {
-        if (!m_calcValue)
+        if (!m_calcValue || m_calcValue->category() != CalcNumber)
             return false;
         m_sourceRange = m_range;
         result = m_calcValue->doubleValue();