Change SelectionStartEnd() returning values instead of assigning into ref args.

third_party/WebKit/Source/core/editing/LayoutSelection.cpp

Index: third_party/WebKit/Source/core/editing/LayoutSelection.cpp
diff --git a/third_party/WebKit/Source/core/editing/LayoutSelection.cpp b/third_party/WebKit/Source/core/editing/LayoutSelection.cpp
index 718f97acdc5a45c50f7af4ec522ec518368d968b..1e65111e8c7b173dd1b3d5b57988eb99bcf579f6 100644
--- a/third_party/WebKit/Source/core/editing/LayoutSelection.cpp
+++ b/third_party/WebKit/Source/core/editing/LayoutSelection.cpp
@@ -306,10 +306,9 @@ void LayoutSelection::SetSelection(
     i->key->SetShouldInvalidateSelection();
 }
 
-void LayoutSelection::SelectionStartEnd(int& start_pos, int& end_pos) {
+std::pair<int, int> LayoutSelection::SelectionStartEnd() {
   Commit();
-  start_pos = selection_start_pos_;
-  end_pos = selection_end_pos_;
+  return std::make_pair(selection_start_pos_, selection_end_pos_);
 }
 
 void LayoutSelection::ClearSelection() {