Bug 1727271: part 3) const-qualify `Document::HasValidTransientUserGestureActivation`. r=edgar

Depends on D123438

Differential Revision: https://phabricator.services.mozilla.com/D123450

dom/base/Document.cpp

@@ -15922,7 +15922,7 @@ void Document::ClearUserGestureActivation() {
   }
 }
 
-bool Document::HasValidTransientUserGestureActivation() {
+bool Document::HasValidTransientUserGestureActivation() const {
   RefPtr<WindowContext> wc = GetWindowContext();
   return wc && wc->HasValidTransientUserGestureActivation();
 }

dom/base/Document.h

@@ -3645,7 +3645,7 @@ class Document : public nsINode,
 
   // Return true if there is transient user gesture activation and it hasn't yet
   // timed out.
-  bool HasValidTransientUserGestureActivation();
+  bool HasValidTransientUserGestureActivation() const;
 
   // Return true.
   bool ConsumeTransientUserGestureActivation();