Have Node::document() return a reference instead of a pointer

Source/core/html/BaseChooserOnlyDateAndTimeInputType.cpp

Index: Source/core/html/BaseChooserOnlyDateAndTimeInputType.cpp
diff --git a/Source/core/html/BaseChooserOnlyDateAndTimeInputType.cpp b/Source/core/html/BaseChooserOnlyDateAndTimeInputType.cpp
index ae80ddb25381d9e05bc13a454f1ac3cd98c01a31..53392385482854f5973577138c6af2fc4aeef496 100644
--- a/Source/core/html/BaseChooserOnlyDateAndTimeInputType.cpp
+++ b/Source/core/html/BaseChooserOnlyDateAndTimeInputType.cpp
@@ -49,19 +49,19 @@ void BaseChooserOnlyDateAndTimeInputType::handleDOMActivateEvent(Event*)
 
     if (m_dateTimeChooser)
         return;
-    if (!element()->document()->page())
+    if (!element()->document().page())
         return;
     DateTimeChooserParameters parameters;
     if (!element()->setupDateTimeChooserParameters(parameters))
         return;
-    m_dateTimeChooser = element()->document()->page()->chrome().openDateTimeChooser(this, parameters);
+    m_dateTimeChooser = element()->document().page()->chrome().openDateTimeChooser(this, parameters);
 }
 
 void BaseChooserOnlyDateAndTimeInputType::createShadowSubtree()
 {
     DEFINE_STATIC_LOCAL(AtomicString, valueContainerPseudo, ("-webkit-date-and-time-value", AtomicString::ConstructFromLiteral));
 
-    RefPtr<HTMLDivElement> valueContainer = HTMLDivElement::create(element()->document());
+    RefPtr<HTMLDivElement> valueContainer = HTMLDivElement::create(&element()->document());
     valueContainer->setPart(valueContainerPseudo);
     element()->userAgentShadowRoot()->appendChild(valueContainer.get());
     updateAppearance();