Remove now-unnecessary VectorTraits specializations.

Source/core/css/CSSGradientValue.cpp

 /*
  * Copyright (C) 2008 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 96 matching lines @@
     Color color;
     float offset;
     bool specified;
 
     GradientStop()
         : offset(0)
         , specified(false)
     { }
 };
 
-} // namespace blink
-
-// Escape out and declare VectorTraits for GradientStop before it is used
-// in a HeapVector with an inline capacity.
-namespace WTF  {
-
-template<>
-struct VectorTraits<blink::GradientStop> : SimpleClassVectorTraits<blink::GradientStop> {
-    // IsPod<> doesn't handle embedded structs/enums (e.g., Color.)
-    static const bool needsDestruction = false;
-};
-
-} // namespace WTF
-
-namespace blink {
-
 PassRefPtrWillBeRawPtr<CSSGradientValue> CSSGradientValue::gradientWithStylesResolved(const TextLinkColors& textLinkColors, Color currentColor)
 {
     bool derived = false;
     for (auto& stop : m_stops) {
         if (!stop.isHint() && stop.m_color->colorIsDerivedFromElement()) {
             stop.m_colorIsDerivedFromElement = true;
             derived = true;
             break;
         }
     }
@@ skipping 1178 matching lines @@
     visitor->trace(m_firstRadius);
     visitor->trace(m_secondRadius);
     visitor->trace(m_shape);
     visitor->trace(m_sizingBehavior);
     visitor->trace(m_endHorizontalSize);
     visitor->trace(m_endVerticalSize);
     CSSGradientValue::traceAfterDispatch(visitor);
 }
 
 } // namespace blink