Make aura::clients take Window instead of RootWindow

ui/aura/client/capture_client.cc

Index: ui/aura/client/capture_client.cc
diff --git a/ui/aura/client/capture_client.cc b/ui/aura/client/capture_client.cc
index ec53fc272638d2bed0793e5adb3534138bd8a484..cbcabd7393fcbb1a6e4e86220d513141311e7005 100644
--- a/ui/aura/client/capture_client.cc
+++ b/ui/aura/client/capture_client.cc
@@ -15,17 +15,17 @@ namespace client {
 DEFINE_WINDOW_PROPERTY_KEY(
     CaptureClient*, kRootWindowCaptureClientKey, NULL);
 
-void SetCaptureClient(RootWindow* root_window, CaptureClient* client) {
+void SetCaptureClient(Window* root_window, CaptureClient* client) {
   root_window->SetProperty(kRootWindowCaptureClientKey, client);
 }
 
-CaptureClient* GetCaptureClient(RootWindow* root_window) {
+CaptureClient* GetCaptureClient(Window* root_window) {
   return root_window ?
       root_window->GetProperty(kRootWindowCaptureClientKey) : NULL;
 }
 
 Window* GetCaptureWindow(Window* window) {
-  RootWindow* root_window = window->GetRootWindow();
+  Window* root_window = window->GetRootWindow();
   if (!root_window)
     return NULL;
   CaptureClient* capture_client = GetCaptureClient(root_window);