events: Update key-event handlers to not return EventResult.

ui/views/corewm/window_modality_controller.cc

Index: ui/views/corewm/window_modality_controller.cc
diff --git a/ui/views/corewm/window_modality_controller.cc b/ui/views/corewm/window_modality_controller.cc
index dd91a20bb8141574750ef9aaa9ba5f26b31c138e..c6b2a37b7b6d243c3bf1a8cb9497b23d305805c6 100644
--- a/ui/views/corewm/window_modality_controller.cc
+++ b/ui/views/corewm/window_modality_controller.cc
@@ -103,9 +103,10 @@ WindowModalityController::~WindowModalityController() {
 ////////////////////////////////////////////////////////////////////////////////
 // WindowModalityController, aura::EventFilter implementation:
 
-ui::EventResult WindowModalityController::OnKeyEvent(ui::KeyEvent* event) {
+void WindowModalityController::OnKeyEvent(ui::KeyEvent* event) {
   aura::Window* target = static_cast<aura::Window*>(event->target());
-  return GetModalTransient(target) ? ui::ER_CONSUMED : ui::ER_UNHANDLED;
+  if (GetModalTransient(target))
+    event->StopPropagation();
 }
 
 ui::EventResult WindowModalityController::OnMouseEvent(ui::MouseEvent* event) {