Nix GetRootWindowController, use RootWindowController::ForWindow.

ash/touch/touch_hud_debug.cc

Index: ash/touch/touch_hud_debug.cc
diff --git a/ash/touch/touch_hud_debug.cc b/ash/touch/touch_hud_debug.cc
index fa40050b66dcdad8f32963c30dbbf18be6eafbc2..dc63d0b8bae84fafd40c63a2600e950cb314318d 100644
--- a/ash/touch/touch_hud_debug.cc
+++ b/ash/touch/touch_hud_debug.cc
@@ -357,10 +357,8 @@ TouchHudDebug::~TouchHudDebug() {}
 std::unique_ptr<base::DictionaryValue> TouchHudDebug::GetAllAsDictionary() {
   std::unique_ptr<base::DictionaryValue> value(new base::DictionaryValue());
   aura::Window::Windows roots = Shell::Get()->GetAllRootWindows();
-  for (aura::Window::Windows::iterator iter = roots.begin();
-       iter != roots.end(); ++iter) {
-    RootWindowController* controller = GetRootWindowController(*iter);
-    TouchHudDebug* hud = controller->touch_hud_debug();
+  for (RootWindowController* root : Shell::GetAllRootWindowControllers()) {
+    TouchHudDebug* hud = root->touch_hud_debug();
     if (hud) {
       std::unique_ptr<base::ListValue> list = hud->GetLogAsList();
       if (!list->empty())