Eliminate Shell::RootWindowList in favor of aura::Window::Windows.

ash/high_contrast/high_contrast_controller.cc

Index: ash/high_contrast/high_contrast_controller.cc
diff --git a/ash/high_contrast/high_contrast_controller.cc b/ash/high_contrast/high_contrast_controller.cc
index 31a0dbbcc6c39d05385299791e1e6c628e8e8c19..72fe0366bc6a082452cade71b268f6f3397042ac 100644
--- a/ash/high_contrast/high_contrast_controller.cc
+++ b/ash/high_contrast/high_contrast_controller.cc
@@ -18,8 +18,8 @@ void HighContrastController::SetEnabled(bool enabled) {
   enabled_ = enabled;
 
   // Update all active displays.
-  Shell::RootWindowList root_window_list = Shell::GetAllRootWindows();
-  for (Shell::RootWindowList::iterator it = root_window_list.begin();
+  aura::Window::Windows root_window_list = Shell::GetAllRootWindows();
+  for (aura::Window::Windows::iterator it = root_window_list.begin();
       it != root_window_list.end(); it++) {
     UpdateDisplay(*it);
   }
@@ -29,7 +29,7 @@ void HighContrastController::OnRootWindowAdded(aura::RootWindow* root_window) {
   UpdateDisplay(root_window);
 }
 
-void HighContrastController::UpdateDisplay(aura::RootWindow* root_window) {
+void HighContrastController::UpdateDisplay(aura::Window* root_window) {
   root_window->layer()->SetLayerInverted(enabled_);
 }