Eliminate ash::internal namespace

ash/shelf/alternate_app_list_button.cc

Index: ash/shelf/alternate_app_list_button.cc
diff --git a/ash/shelf/alternate_app_list_button.cc b/ash/shelf/alternate_app_list_button.cc
index 8790fba88dad8c313b98e898dacf9d4a57c07cef..f6c87311505c1138f854a4d0d927cd28b2688b2f 100644
--- a/ash/shelf/alternate_app_list_button.cc
+++ b/ash/shelf/alternate_app_list_button.cc
@@ -27,8 +27,6 @@
 #include "ui/views/painter.h"
 
 namespace ash {
-namespace internal {
-
 // static
 const int AlternateAppListButton::kImageBoundsSize = 7;
 
@@ -170,5 +168,4 @@ void AlternateAppListButton::GetAccessibleState(
   state->name = host_->GetAccessibleName(this);
 }
 
-}  // namespace internal
 }  // namespace ash