aura-mus: Implement Deactivate().

services/ui/ws/window_manager_client_unittest.cc

Index: services/ui/ws/window_manager_client_unittest.cc
diff --git a/services/ui/ws/window_manager_client_unittest.cc b/services/ui/ws/window_manager_client_unittest.cc
index 03cd37567e8e0ee4340daf0411fd3a21f7d4f50c..4a5896f9e495882e8bb2c3cc35be77a288da5b1b 100644
--- a/services/ui/ws/window_manager_client_unittest.cc
+++ b/services/ui/ws/window_manager_client_unittest.cc
@@ -80,6 +80,8 @@ class TestWindowManagerDelegate : public aura::WindowManagerDelegate {
       aura::Window* window,
       const gfx::Insets& insets,
       const std::vector<gfx::Rect>& additional_client_areas) override {}
+  bool IsWindowActive(aura::Window* window) override { return true; }
+  void OnWmDeactivateWindow(aura::Window* window) override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestWindowManagerDelegate);