Bug 1634663: part 5) Declare callers of `Selection::GetRangeAt` around toolkit/components/find `const`. r=masayuki

Depends on D73447

Differential Revision: https://phabricator.services.mozilla.com/D73448

toolkit/components/find/nsWebBrowserFind.cpp

@@ -444,7 +444,7 @@ nsresult nsWebBrowserFind::GetSearchLimits(nsRange* aSearchRange,
   // There are four possible range endpoints we might use:
   // DocumentStart, SelectionStart, SelectionEnd, DocumentEnd.
 
-  RefPtr<nsRange> range;
+  RefPtr<const nsRange> range;
   nsCOMPtr<nsINode> node;
   uint32_t offset;
 

toolkit/components/typeaheadfind/nsTypeAheadFind.cpp

@@ -776,7 +776,7 @@ nsresult nsTypeAheadFind::GetSearchContainers(
 
   // Consider current selection as null if
   // it's not in the currently focused document
-  RefPtr<nsRange> currentSelectionRange;
+  RefPtr<const nsRange> currentSelectionRange;
   RefPtr<PresShell> selectionPresShell = GetPresShell();
   if (aSelectionController && selectionPresShell &&
       selectionPresShell == presShell) {
@@ -1058,7 +1058,7 @@ nsresult nsTypeAheadFind::FindInternal(uint32_t aMode,
 
       mStartFindRange = nullptr;
       if (selection) {
-        RefPtr<nsRange> startFindRange = selection->GetRangeAt(0);
+        RefPtr<const nsRange> startFindRange = selection->GetRangeAt(0);
         if (startFindRange) {
           mStartFindRange = startFindRange->CloneRange();
         }