WIP: Eliminate event.target() usage from TrayEventFilter

ui/views/mus/window_manager_connection_unittest.cc

Index: ui/views/mus/window_manager_connection_unittest.cc
diff --git a/ui/views/mus/window_manager_connection_unittest.cc b/ui/views/mus/window_manager_connection_unittest.cc
index aba26448aa9698320c9a6c4597b9623114fd77d9..ba83ea14bb54db0a7a256378add69a33912d29dd 100644
--- a/ui/views/mus/window_manager_connection_unittest.cc
+++ b/ui/views/mus/window_manager_connection_unittest.cc
@@ -26,11 +26,13 @@ class TestPointerWatcher : public PointerWatcher {
 
   // PointerWatcher:
   void OnMousePressed(const ui::MouseEvent& event,
-                      const gfx::Point& location_in_screen) override {
+                      const gfx::Point& location_in_screen,
+                      Widget* target) override {
     last_event_ = ui::Event::Clone(event);
   }
   void OnTouchPressed(const ui::TouchEvent& event,
-                      const gfx::Point& location_in_screen) override {
+                      const gfx::Point& location_in_screen,
+                      Widget* target) override {
     last_event_ = ui::Event::Clone(event);
   }
 
@@ -48,7 +50,7 @@ class WindowManagerConnectionTest : public testing::Test {
   ~WindowManagerConnectionTest() override {}
 
   void OnEventObserved(const ui::Event& event) {
-    WindowManagerConnection::Get()->OnEventObserved(event);
+    WindowManagerConnection::Get()->OnEventObserved(event, nullptr);
   }
 
  private: