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

ui/views/widget/native_widget_aura.cc

Index: ui/views/widget/native_widget_aura.cc
diff --git a/ui/views/widget/native_widget_aura.cc b/ui/views/widget/native_widget_aura.cc
index 52c77483c61ba7cfbf22cf48046ea13a0ebaecea..e9b29c5efa7ef803a29465a10d87508fed0dbd32 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -647,7 +647,8 @@ ui::NativeTheme* NativeWidgetAura::GetNativeTheme() const {
 
 void NativeWidgetAura::DispatchKeyEventPostIME(const ui::KeyEvent& key) {
   FocusManager* focus_manager = GetWidget()->GetFocusManager();
-  if (delegate_->OnKeyEvent(key) || !focus_manager)
+  delegate_->OnKeyEvent(const_cast<ui::KeyEvent*>(&key));
+  if (key.handled() || !focus_manager)
     return;
   focus_manager->OnKeyEvent(key);
 }
@@ -768,20 +769,20 @@ scoped_refptr<ui::Texture> NativeWidgetAura::CopyTexture() {
 ////////////////////////////////////////////////////////////////////////////////
 // NativeWidgetAura, ui::EventHandler implementation:
 
-ui::EventResult NativeWidgetAura::OnKeyEvent(ui::KeyEvent* event) {
+void NativeWidgetAura::OnKeyEvent(ui::KeyEvent* event) {
   if (event->is_char()) {
     // If a ui::InputMethod object is attached to the root window, character
     // events are handled inside the object and are not passed to this function.
     // If such object is not attached, character events might be sent (e.g. on
     // Windows). In this case, we just skip these.
-    return ui::ER_UNHANDLED;
+    return;
   }
   // Renderer may send a key event back to us if the key event wasn't handled,
   // and the window may be invisible by that time.
   if (!window_->IsVisible())
-    return ui::ER_UNHANDLED;
+    return;
   GetWidget()->GetInputMethod()->DispatchKeyEvent(*event);
-  return ui::ER_HANDLED;
+  event->SetHandled();
 }
 
 ui::EventResult NativeWidgetAura::OnMouseEvent(ui::MouseEvent* event) {