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

Source/core/page/Chrome.cpp

Index: Source/core/page/Chrome.cpp
diff --git a/Source/core/page/Chrome.cpp b/Source/core/page/Chrome.cpp
index 1def1b5e9800cebda9c6155dc57b990716838151..7cbe6340860d6de12f699acbe5b36902ea9adeb2 100644
--- a/Source/core/page/Chrome.cpp
+++ b/Source/core/page/Chrome.cpp
@@ -398,7 +398,7 @@ void Chrome::setToolTip(const HitTestResult& result)
     if (toolTip.isEmpty()) {
         if (Node* node = result.innerNonSharedNode()) {
             if (node->hasTagName(inputTag)) {
-                HTMLInputElement* input = static_cast<HTMLInputElement*>(node);
+                Handle<HTMLInputElement> input(static_cast<HTMLInputElement*>(node));
                 toolTip = input->defaultToolTip();
 
                 // FIXME: We should obtain text direction of tooltip from