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

chrome/browser/ui/views/bubble/bubble.cc

Index: chrome/browser/ui/views/bubble/bubble.cc
diff --git a/chrome/browser/ui/views/bubble/bubble.cc b/chrome/browser/ui/views/bubble/bubble.cc
index f16c03ff204aa2c354e69066b0fc117ef359ba77..7274548204002444f1087759f7ccef8f822579b5 100644
--- a/chrome/browser/ui/views/bubble/bubble.cc
+++ b/chrome/browser/ui/views/bubble/bubble.cc
@@ -443,7 +443,7 @@ void Bubble::Fade(bool fade_in) {
     animation_->Hide();
 }
 
-bool Bubble::AcceleratorPressed(const views::Accelerator& accelerator) {
+bool Bubble::AcceleratorPressed(const ui::Accelerator& accelerator) {
   if (!delegate_ || delegate_->CloseOnEscape()) {
     DoClose(true);
     return true;