Have Frame::loader() return a reference

Source/core/html/parser/HTMLConstructionSite.cpp

Index: Source/core/html/parser/HTMLConstructionSite.cpp
diff --git a/Source/core/html/parser/HTMLConstructionSite.cpp b/Source/core/html/parser/HTMLConstructionSite.cpp
index 6dcaad9b47bde6655c7eb6d0b02e85af44591e4f..4db3db9d6ec75a57ba6889556911c551cce62e0e 100644
--- a/Source/core/html/parser/HTMLConstructionSite.cpp
+++ b/Source/core/html/parser/HTMLConstructionSite.cpp
@@ -298,7 +298,7 @@ void HTMLConstructionSite::dispatchDocumentElementAvailableIfNeeded()
 {
     ASSERT(m_document);
     if (m_document->frame() && !m_isParsingFragment)
-        m_document->frame()->loader()->dispatchDocumentElementAvailable();
+        m_document->frame()->loader().dispatchDocumentElementAvailable();
 }
 
 void HTMLConstructionSite::insertHTMLHtmlStartTagBeforeHTML(AtomicHTMLToken* token)
@@ -516,7 +516,7 @@ void HTMLConstructionSite::insertHTMLBodyElement(AtomicHTMLToken* token)
     attachLater(currentNode(), body);
     m_openElements.pushHTMLBodyElement(HTMLStackItem::create(body.release(), token));
     if (Frame* frame = m_document->frame())
-        frame->loader()->client()->dispatchWillInsertBody();
+        frame->loader().client()->dispatchWillInsertBody();
 }
 
 void HTMLConstructionSite::insertHTMLFormElement(AtomicHTMLToken* token, bool isDemoted)