Moves MruWindowTracker to WmShell

ash/aura/wm_shell_aura.cc

Index: ash/aura/wm_shell_aura.cc
diff --git a/ash/aura/wm_shell_aura.cc b/ash/aura/wm_shell_aura.cc
index 7b6e2e16c515db54371d5058c1b336f624a2fc82..57608dabeef2e472b7241bfebfb79cb9db343586 100644
--- a/ash/aura/wm_shell_aura.cc
+++ b/ash/aura/wm_shell_aura.cc
@@ -69,19 +69,6 @@ WmWindow* WmShellAura::GetRootWindowForNewWindows() {
   return WmWindowAura::Get(Shell::GetTargetRootWindow());
 }
 
-std::vector<WmWindow*> WmShellAura::GetMruWindowList() {
-  // TODO(sky): remove this and provide accessor for MruWindowTracker.
-  // http://crbug.com/617789.
-  return Shell::GetInstance()->mru_window_tracker()->BuildMruWindowList();
-}
-
-std::vector<WmWindow*> WmShellAura::GetMruWindowListIgnoreModals() {
-  // TODO(sky): remove this and provide accessor for MruWindowTracker.
-  // http://crbug.com/617789.
-  return Shell::GetInstance()
-      ->mru_window_tracker()
-      ->BuildWindowListIgnoreModal();
-}
 
 bool WmShellAura::IsForceMaximizeOnFirstRun() {
   return Shell::GetInstance()->delegate()->IsForceMaximizeOnFirstRun();