Eliminate ash::internal namespace

ash/accelerators/accelerator_filter.cc

Index: ash/accelerators/accelerator_filter.cc
diff --git a/ash/accelerators/accelerator_filter.cc b/ash/accelerators/accelerator_filter.cc
index da552b9326f7a9610cf7e286043a6034ad882786..7dc7f086147cea2575014a427fb49c8bf1f3aa47 100644
--- a/ash/accelerators/accelerator_filter.cc
+++ b/ash/accelerators/accelerator_filter.cc
@@ -85,8 +85,6 @@ bool ShouldProcessAcceleratorsNow(const ui::Accelerator& accelerator,
 
 }  // namespace
 
-namespace internal {
-
 ////////////////////////////////////////////////////////////////////////////////
 // AcceleratorFilter, public:
 
@@ -133,5 +131,4 @@ void AcceleratorFilter::OnKeyEvent(ui::KeyEvent* event) {
     event->StopPropagation();
 }
 
-}  // namespace internal
 }  // namespace ash