Bug 1578379 - Remove some silly ifdefs. r=bzbarsky

mDummy doesn't even exist anymore.

Differential Revision: https://phabricator.services.mozilla.com/D45920

--HG--
extra : moz-landing-system : lando

dom/base/Document.cpp

@@ -1312,11 +1312,7 @@ Document::Document(const char* aContentType)
       mCompatMode(eCompatibility_FullStandards),
       mReadyState(ReadyState::READYSTATE_UNINITIALIZED),
       mAncestorIsLoading(false),
-#ifdef MOZILLA_INTERNAL_API
       mVisibilityState(dom::VisibilityState::Hidden),
-#else
-      mDummy(0),
-#endif
       mType(eUnknown),
       mDefaultElementType(0),
       mAllowXULXBL(eTriUnset),

dom/base/Document.h

@@ -3668,10 +3668,9 @@ class Document : public nsINode,
   // Checks that the caller is either chrome or some addon.
   static bool IsCallerChromeOrAddon(JSContext* aCx, JSObject* aObject);
 
-#ifdef MOZILLA_INTERNAL_API
   bool Hidden() const { return mVisibilityState != VisibilityState::Visible; }
   dom::VisibilityState VisibilityState() const { return mVisibilityState; }
-#endif
+
   void GetSelectedStyleSheetSet(nsAString& aSheetSet);
   void SetSelectedStyleSheetSet(const nsAString& aSheetSet);
   void GetLastStyleSheetSet(nsAString& aSheetSet) {