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

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

 // Copyright 2015 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.
 
 #ifndef CSSStyleValue_h
 #define CSSStyleValue_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/CoreExport.h"
 #include "core/css/CSSValue.h"
@@ skipping 34 matching lines @@
 
   static ScriptValue parse(ScriptState*,
                            const String& property_name,
                            const String& value,
                            ExceptionState&);
 
   virtual const CSSValue* ToCSSValue() const = 0;
   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() {}
 
  protected:
   CSSStyleValue() {}
 };
 
 typedef HeapVector<Member<CSSStyleValue>> CSSStyleValueVector;
 
 }  // namespace blink
 
 #endif