Bug 1675397 - Part 1: Use RefPtr<Element> for nsFocusManager::mFirst{Blur|Focus}Event; r=hsivonen

Differential Revision: https://phabricator.services.mozilla.com/D95946

dom/base/nsFocusManager.cpp

@@ -2118,7 +2118,9 @@ bool nsFocusManager::BlurImpl(BrowsingContext* aBrowsingContextToClear,
       mFocusedElement = nullptr;
       return true;
     }
-    if (element == mFirstBlurEvent) return true;
+    if (element == mFirstBlurEvent) {
+      return true;
+    }
   }
 
   RefPtr<BrowsingContext> focusedBrowsingContext = GetFocusedBrowsingContext();

dom/base/nsFocusManager.h

@@ -870,8 +870,8 @@ class nsFocusManager final : public nsIFocusManager,
   // these fields store a content node temporarily while it is being focused
   // or blurred to ensure that a recursive call doesn't refire the same event.
   // They will always be cleared afterwards.
-  nsCOMPtr<nsIContent> mFirstBlurEvent;
-  nsCOMPtr<nsIContent> mFirstFocusEvent;
+  RefPtr<mozilla::dom::Element> mFirstBlurEvent;
+  RefPtr<mozilla::dom::Element> mFirstFocusEvent;
 
   // keep track of a window while it is being lowered
   nsCOMPtr<nsPIDOMWindowOuter> mWindowBeingLowered;