Removes unused parameter from RootWindow::OnWindowHidden.

BUG=none
TEST=none

Review URL: https://chromiumcodereview.appspot.com/22325002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@215849 0039d316-1c4b-4281-b951-d872f2087c98

ui/aura/root_window.cc

@@ -353,7 +353,7 @@ bool RootWindow::DispatchGestureEvent(ui::GestureEvent* event) {
 
 void RootWindow::OnWindowDestroying(Window* window) {
   DispatchMouseExitToHidingWindow(window);
-  OnWindowHidden(window, WINDOW_DESTROYED, NULL);
+  OnWindowHidden(window, WINDOW_DESTROYED);
 
   if (window->IsVisible() &&
       window->ContainsPointInRoot(GetLastMouseLocationInRoot())) {
@@ -389,7 +389,7 @@ void RootWindow::DispatchMouseExitToHidingWindow(Window* window) {
 
 void RootWindow::OnWindowVisibilityChanged(Window* window, bool is_visible) {
   if (!is_visible)
-    OnWindowHidden(window, WINDOW_HIDDEN, NULL);
+    OnWindowHidden(window, WINDOW_HIDDEN);
 
   if (window->ContainsPointInRoot(GetLastMouseLocationInRoot()))
     PostMouseMoveEventAfterWindowChange();
@@ -788,7 +788,7 @@ void RootWindow::OnWindowRemovedFromRootWindow(Window* detached,
   DCHECK(aura::client::GetCaptureWindow(this) != this);
 
   DispatchMouseExitToHidingWindow(detached);
-  OnWindowHidden(detached, new_root ? WINDOW_MOVING : WINDOW_HIDDEN, new_root);
+  OnWindowHidden(detached, new_root ? WINDOW_MOVING : WINDOW_HIDDEN);
 
   if (detached->IsVisible() &&
       detached->ContainsPointInRoot(GetLastMouseLocationInRoot())) {
@@ -796,9 +796,7 @@ void RootWindow::OnWindowRemovedFromRootWindow(Window* detached,
   }
 }
 
-void RootWindow::OnWindowHidden(Window* invisible,
-                                WindowHiddenReason reason,
-                                RootWindow* new_root) {
+void RootWindow::OnWindowHidden(Window* invisible, WindowHiddenReason reason) {
   // TODO(beng): This should be removed once FocusController is turned on.
   if (client::GetFocusClient(this)) {
     client::GetFocusClient(this)->OnWindowHiddenInRootWindow(

ui/aura/root_window.h

@@ -338,11 +338,8 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
 
   // Called when a window becomes invisible, either by being removed
   // from root window hierarchy, via SetVisible(false) or being destroyed.
-  // |reason| specifies what triggered the hiding. |new_root| is the new root
-  // window, and may be NULL.
-  void OnWindowHidden(Window* invisible,
-                      WindowHiddenReason reason,
-                      RootWindow* new_root);
+  // |reason| specifies what triggered the hiding.
+  void OnWindowHidden(Window* invisible, WindowHiddenReason reason);
 
   // Cleans up the gesture recognizer for all windows in |window| (including
   // |window| itself).