[cros] Add network tray item for mobile network setup.

chrome/browser/chromeos/status/network_menu.h

Index: chrome/browser/chromeos/status/network_menu.h
diff --git a/chrome/browser/chromeos/status/network_menu.h b/chrome/browser/chromeos/status/network_menu.h
index 6db277d3a74050e23db936a1862c457692ce6c3f..57e503ab02794a544019ae355c77164aa6030eb4 100644
--- a/chrome/browser/chromeos/status/network_menu.h
+++ b/chrome/browser/chromeos/status/network_menu.h
@@ -15,6 +15,8 @@
 #include "ui/gfx/native_widget_types.h"  // gfx::NativeWindow
 #include "ui/views/controls/button/menu_button_listener.h"
 
+class Browser;
+
 namespace ui {
 class MenuModel;
 }
@@ -118,6 +120,10 @@ class NetworkMenu {
  private:
   friend class NetworkMenuModel;
 
+  // Returns the last active browser. If there is no such browser, creates a new
+  // browser window with an empty tab and returns it.
+  Browser* GetAppropriateBrowser();
+
   // Weak ptr to delegate.
   Delegate* delegate_;