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

Source/core/rendering/HitTestResult.cpp

Index: Source/core/rendering/HitTestResult.cpp
diff --git a/Source/core/rendering/HitTestResult.cpp b/Source/core/rendering/HitTestResult.cpp
index 62fcfa4b2c70529a5bde33ca7e5fb34a911f0175..223b29caccc90e4f5d29749768ae8c9e7fe09413 100644
--- a/Source/core/rendering/HitTestResult.cpp
+++ b/Source/core/rendering/HitTestResult.cpp
@@ -274,7 +274,7 @@ String HitTestResult::altDisplayString() const
     }
     
     if (m_innerNonSharedNode->hasTagName(inputTag)) {
-        HTMLInputElement* input = static_cast<HTMLInputElement*>(m_innerNonSharedNode.get());
+        Handle<HTMLInputElement> input(static_cast<HTMLInputElement*>(m_innerNonSharedNode.get()));
         return displayString(input->alt(), m_innerNonSharedNode.get());
     }