Restructure type tracking in StyleValues to work better with new numeric types

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

 // Copyright 2017 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 CSSNumericValue_h
 #define CSSNumericValue_h
 
 #include "core/CoreExport.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/cssom/CSSStyleValue.h"
@@ skipping 31 matching lines @@
   virtual CSSNumericValue* div(double, ExceptionState&) {
     // TODO(meade): Implement.
     return nullptr;
   }
 
   virtual CSSNumericValue* to(const String&, ExceptionState&) {
     // TODO(meade): Implement.
     return nullptr;
   }
 
-  // Internal methods.
   virtual CSSUnitValue* to(CSSPrimitiveValue::UnitType) { return nullptr; }
-  bool ContainsPercent() const {
-    // TODO(meade): Implement.
-    return false;
-  }
 
  protected:
   CSSNumericValue() {}
 };
 
 }  // namespace blink
 
 #endif  // CSSNumericValue_h