Eliminate ash::internal namespace

ash/display/virtual_keyboard_window_controller.h

Index: ash/display/virtual_keyboard_window_controller.h
diff --git a/ash/display/virtual_keyboard_window_controller.h b/ash/display/virtual_keyboard_window_controller.h
index 16865396eef2948491206af05f588529179bb374..23dd40635761932207ae0f6547d09a53bab19127 100644
--- a/ash/display/virtual_keyboard_window_controller.h
+++ b/ash/display/virtual_keyboard_window_controller.h
@@ -16,15 +16,13 @@ class KeyboardController;
 }
 
 namespace ash {
+class DisplayInfo;
+class RootWindowController;
 
 namespace test {
 class VirtualKeyboardWindowControllerTest;
 }  // namespace test
 
-namespace internal {
-class DisplayInfo;
-class RootWindowController;
-
 // This class maintains the RootWindowController dedicated for
 // virtual keyboard.
 class ASH_EXPORT VirtualKeyboardWindowController : public ShellObserver {
@@ -60,7 +58,6 @@ class ASH_EXPORT VirtualKeyboardWindowController : public ShellObserver {
   DISALLOW_COPY_AND_ASSIGN(VirtualKeyboardWindowController);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_VIRTUAL_KEYBOARD_WINDOW_CONTROLLER_H_