Allow focus to be sent between browser window and launcher/status window

ash/shell/shell_main.cc

Index: ash/shell/shell_main.cc
diff --git a/ash/shell/shell_main.cc b/ash/shell/shell_main.cc
index 93029909995e58ede9cc7028bd47dde6a0071fea..6d60afa44d8e4b882c9bbb6594b517980a3cfae1 100644
--- a/ash/shell/shell_main.cc
+++ b/ash/shell/shell_main.cc
@@ -155,6 +155,10 @@ class ShellDelegateImpl : public ash::ShellDelegate {
     return windows;
   }
 
+  virtual void RotateFocus(bool forward) OVERRIDE {
+    // Not Implemented
+  }
+
   virtual void LauncherItemClicked(
       const ash::LauncherItem& item) OVERRIDE {
     aura::Window* window = watcher_->GetWindowByID(item.id);