ChromeOS: Fix NewWindow's bug with browser on other user's desktop and no browser on current's

chrome/browser/ui/ash/chrome_new_window_client.h

Index: chrome/browser/ui/ash/chrome_new_window_client.h
diff --git a/chrome/browser/ui/ash/chrome_new_window_client.h b/chrome/browser/ui/ash/chrome_new_window_client.h
index f8bcb0f59473e8565f95cf94f39643b1a1982404..0004039f9350624622c7ea74bdf09b186903c0f8 100644
--- a/chrome/browser/ui/ash/chrome_new_window_client.h
+++ b/chrome/browser/ui/ash/chrome_new_window_client.h
@@ -11,11 +11,16 @@
 #include "base/macros.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
 
+class Browser;
+
 class ChromeNewWindowClient : public ash::mojom::NewWindowClient {
  public:
   ChromeNewWindowClient();
   ~ChromeNewWindowClient() override;
 
+  // Returns the active browser that has active browser window, if any.
+  static Browser* GetActiveBrowser();
+
   // Overridden from ash::mojom::NewWindowClient:
   void NewTab() override;
   void NewWindow(bool incognito) override;