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

chrome/browser/ui/panels/panel_browser_view.cc

Index: chrome/browser/ui/panels/panel_browser_view.cc
diff --git a/chrome/browser/ui/panels/panel_browser_view.cc b/chrome/browser/ui/panels/panel_browser_view.cc
index fe84d774019a734c6e51613234fe1040956c6771..b746c7e0f87b4ec539af27a0bd9c29dc42d51287 100644
--- a/chrome/browser/ui/panels/panel_browser_view.cc
+++ b/chrome/browser/ui/panels/panel_browser_view.cc
@@ -179,7 +179,7 @@ void PanelBrowserView::OnWidgetActivationChanged(views::Widget* widget,
 }
 
 bool PanelBrowserView::AcceleratorPressed(
-    const views::Accelerator& accelerator) {
+    const ui::Accelerator& accelerator) {
   if (mouse_pressed_ && accelerator.key_code() == ui::VKEY_ESCAPE) {
     OnTitlebarMouseCaptureLost();
     return true;