Revert of Move most of the [Pass]RefPtr's of CSSPrimitiveValue to our transition types.

Source/core/css/CSSGradientValue.cpp

Index: Source/core/css/CSSGradientValue.cpp
diff --git a/Source/core/css/CSSGradientValue.cpp b/Source/core/css/CSSGradientValue.cpp
index a5bbb783054c295e465c4f5203b4ddac091cc2b2..708e7c99b526e4798836de49cc741ded42a827dc 100644
--- a/Source/core/css/CSSGradientValue.cpp
+++ b/Source/core/css/CSSGradientValue.cpp
@@ -43,12 +43,6 @@
 
 namespace WebCore {
 
-void CSSGradientColorStop::trace(Visitor* visitor)
-{
-    visitor->trace(m_position);
-    visitor->trace(m_color);
-}
-
 PassRefPtr<Image> CSSGradientValue::image(RenderObject* renderer, const IntSize& size)
 {
     if (size.isEmpty())
@@ -467,11 +461,6 @@
 
 void CSSGradientValue::traceAfterDispatch(Visitor* visitor)
 {
-    visitor->trace(m_firstX);
-    visitor->trace(m_firstY);
-    visitor->trace(m_secondX);
-    visitor->trace(m_secondY);
-    visitor->trace(m_stops);
     CSSImageGeneratorValue::traceAfterDispatch(visitor);
 }
 
@@ -750,7 +739,6 @@
 
 void CSSLinearGradientValue::traceAfterDispatch(Visitor* visitor)
 {
-    visitor->trace(m_angle);
     CSSGradientValue::traceAfterDispatch(visitor);
 }
 
@@ -1184,12 +1172,6 @@
 
 void CSSRadialGradientValue::traceAfterDispatch(Visitor* visitor)
 {
-    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);
 }