Bug 1404734 - remove remaining use of nsIDOMHTMLImageElement from mailnews. r=aceman

mailnews/base/src/nsMsgContentPolicy.cpp

@@ -19,12 +19,12 @@
 #include "nsIDocShellTreeItem.h"
 #include "nsIWebNavigation.h"
 #include "nsContentPolicyUtils.h"
-#include "nsIDOMHTMLImageElement.h"
 #include "nsIFrameLoader.h"
 #include "nsIWebProgress.h"
 #include "nsMsgUtils.h"
 #include "nsThreadUtils.h"
 #include "mozilla/mailnews/MimeHeaderParser.h"
+#include "mozilla/dom/HTMLImageElement.h"
 #include "nsINntpUrl.h"
 
 static const char kBlockRemoteImages[] = "mailnews.message_display.disable_remote_image";
@@ -672,8 +672,10 @@ void nsMsgContentPolicy::ComposeShouldLoad(nsIMsgCompose *aMsgCompose,
     {
       bool insertingQuotedContent = true;
       aMsgCompose->GetInsertingQuotedContent(&insertingQuotedContent);
-      nsCOMPtr<nsIDOMHTMLImageElement> imageElement(do_QueryInterface(aRequestingContext));
-      if (imageElement)
+      nsCOMPtr<Element> element = do_QueryInterface(aRequestingContext);
+      RefPtr<mozilla::dom::HTMLImageElement> image =
+        mozilla::dom::HTMLImageElement::FromContentOrNull(element);
+      if (image)
       {
         if (!insertingQuotedContent)
         {

mailnews/compose/src/nsMsgCompose.cpp

@@ -8,7 +8,6 @@
 #include "nsIDOMNode.h"
 #include "nsIDOMNodeList.h"
 #include "nsIDOMText.h"
-#include "nsIDOMHTMLImageElement.h"
 #include "nsPIDOMWindow.h"
 #include "mozIDOMWindow.h"
 #include "nsISelectionController.h"

mailnews/compose/src/nsMsgSend.cpp

@@ -27,7 +27,6 @@
 #include "nsMsgCopy.h"
 #include "nsUnicharUtils.h"
 #include "nsMsgPrompts.h"
-#include "nsIDOMHTMLImageElement.h"
 #include "nsCExternalHandlerService.h"
 #include "nsIMIMEService.h"
 #include "nsIDocument.h"