[CSS Typed OM] Delete obsolete number and length classes from Typed OM

third_party/WebKit/Source/core/css/cssom/CSSStyleValue.h

Index: third_party/WebKit/Source/core/css/cssom/CSSStyleValue.h
diff --git a/third_party/WebKit/Source/core/css/cssom/CSSStyleValue.h b/third_party/WebKit/Source/core/css/cssom/CSSStyleValue.h
index 0d4c10d5a0c6f24d24b32f49e5cba0e794792a3e..f90a1f63cdf6af053d56944bc45bd1f287667a1f 100644
--- a/third_party/WebKit/Source/core/css/cssom/CSSStyleValue.h
+++ b/third_party/WebKit/Source/core/css/cssom/CSSStyleValue.h
@@ -52,7 +52,12 @@ class CORE_EXPORT CSSStyleValue
   virtual const CSSValue* ToCSSValueWithProperty(CSSPropertyID) const {
     return ToCSSValue();
   }
-  virtual String cssText() const { return ToCSSValue()->CssText(); }
+  virtual String cssText() const {
+    const CSSValue* result = ToCSSValue();
+    // TODO(meade): Remove this once all the number and length types are
+    // rewritten.
+    return result ? result->CssText() : "";
+  }
 
   DEFINE_INLINE_VIRTUAL_TRACE() {}