Move views::Accelerator to ui in order to use it from aura code.

views/controls/tabbed_pane/tabbed_pane.cc

Index: views/controls/tabbed_pane/tabbed_pane.cc
diff --git a/views/controls/tabbed_pane/tabbed_pane.cc b/views/controls/tabbed_pane/tabbed_pane.cc
index d17a3f73aff722485d8dda2324ce81f78e639476..4dcc93dbd25f31852e48d3473fee1f1cc702fde9 100644
--- a/views/controls/tabbed_pane/tabbed_pane.cc
+++ b/views/controls/tabbed_pane/tabbed_pane.cc
@@ -91,7 +91,7 @@ void TabbedPane::ViewHierarchyChanged(bool is_add, View* parent, View* child) {
   }
 }
 
-bool TabbedPane::AcceleratorPressed(const views::Accelerator& accelerator) {
+bool TabbedPane::AcceleratorPressed(const ui::Accelerator& accelerator) {
   // We only accept Ctrl+Tab keyboard events.
   DCHECK(accelerator.key_code() == ui::VKEY_TAB && accelerator.IsCtrlDown());