Moves WindowSelectorController onto WmShell

ash/mus/bridge/wm_shell_mus.cc

Index: ash/mus/bridge/wm_shell_mus.cc
diff --git a/ash/mus/bridge/wm_shell_mus.cc b/ash/mus/bridge/wm_shell_mus.cc
index 2eb8244f4595cf75df212f0633d2ed8c07892e00..c0a882a465c7736174efa82cd49b586c176461be 100644
--- a/ash/mus/bridge/wm_shell_mus.cc
+++ b/ash/mus/bridge/wm_shell_mus.cc
@@ -104,6 +104,7 @@ WmShellMus::WmShellMus(::mus::WindowTreeClient* client)
 
 WmShellMus::~WmShellMus() {
   SetSystemTrayDelegate(nullptr);
+  DeleteWindowSelectorController();
   wm_shell_common_->DeleteMruWindowTracker();
   RemoveClientObserver();
   WmShell::Set(nullptr);
@@ -232,16 +233,6 @@ void WmShellMus::OnOverviewModeEnded() {
                     OnOverviewModeEnded());
 }
 
-bool WmShellMus::IsOverviewModeSelecting() {
-  NOTIMPLEMENTED();
-  return false;
-}
-
-bool WmShellMus::IsOverviewModeRestoringMinimizedWindows() {
-  NOTIMPLEMENTED();
-  return false;
-}
-
 AccessibilityDelegate* WmShellMus::GetAccessibilityDelegate() {
   return accessibility_delegate_.get();
 }