[oilpan] Completely move HTMLFormControlElement's hierarchy to the managed heap

Source/core/rendering/RenderSlider.cpp

Index: Source/core/rendering/RenderSlider.cpp
diff --git a/Source/core/rendering/RenderSlider.cpp b/Source/core/rendering/RenderSlider.cpp
index f4444757145c1720af44e9e9a659b8dee8f058d8..086467de120273e965d45aabe0f0ffb947b5d1b1 100644
--- a/Source/core/rendering/RenderSlider.cpp
+++ b/Source/core/rendering/RenderSlider.cpp
@@ -48,8 +48,8 @@ namespace WebCore {
 
 const int RenderSlider::defaultTrackLength = 129;
 
-RenderSlider::RenderSlider(HTMLInputElement* element)
-    : RenderFlexibleBox(element)
+RenderSlider::RenderSlider(Handle<HTMLInputElement> element)
+    : RenderFlexibleBox(element.raw())
 {
     // We assume RenderSlider works only with <input type=range>.
     ASSERT(element->isRangeControl());