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

ui/aura/window_unittest.cc

Index: ui/aura/window_unittest.cc
diff --git a/ui/aura/window_unittest.cc b/ui/aura/window_unittest.cc
index 6289000c45b7f9fec71f05da90a3ac86f85c71fe..1aec91f6a708aef4a650e858d9ea47c9f930c021 100644
--- a/ui/aura/window_unittest.cc
+++ b/ui/aura/window_unittest.cc
@@ -171,11 +171,10 @@ class CaptureWindowDelegateImpl : public TestWindowDelegate {
   int touch_event_count() const { return touch_event_count_; }
   int gesture_event_count() const { return gesture_event_count_; }
 
-  virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE {
+  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE {
     if (event->type() == ui::ET_MOUSE_CAPTURE_CHANGED)
       capture_changed_event_count_++;
     mouse_event_count_++;
-    return ui::ER_UNHANDLED;
   }
   virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE {
     touch_event_count_++;
@@ -1072,7 +1071,7 @@ class MouseEnterExitWindowDelegate : public TestWindowDelegate {
  public:
   MouseEnterExitWindowDelegate() : entered_(false), exited_(false) {}
 
-  virtual ui::EventResult OnMouseEvent(ui::MouseEvent* event) OVERRIDE {
+  virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE {
     switch (event->type()) {
       case ui::ET_MOUSE_ENTERED:
         entered_ = true;
@@ -1083,7 +1082,6 @@ class MouseEnterExitWindowDelegate : public TestWindowDelegate {
       default:
         break;
     }
-    return ui::ER_UNHANDLED;
   }
 
   bool entered() const { return entered_; }