Eliminate ash::internal namespace

ash/system/chromeos/brightness/tray_brightness_unittest.cc

Index: ash/system/chromeos/brightness/tray_brightness_unittest.cc
diff --git a/ash/system/chromeos/brightness/tray_brightness_unittest.cc b/ash/system/chromeos/brightness/tray_brightness_unittest.cc
index 72e181662e4dad837172d1a714b6a205c96d3532..a1b5d70aa26b40aae516e38110bb0e16fe78650c 100644
--- a/ash/system/chromeos/brightness/tray_brightness_unittest.cc
+++ b/ash/system/chromeos/brightness/tray_brightness_unittest.cc
@@ -11,7 +11,6 @@
 #include "ui/views/view.h"
 
 namespace ash {
-
 namespace {
 
 user::LoginStatus GetUserLoginStatus() {
@@ -20,8 +19,6 @@ user::LoginStatus GetUserLoginStatus() {
 
 }  // namespace
 
-namespace internal {
-
 class TrayBrightnessTest : public test::AshTestBase {
  public:
   TrayBrightnessTest() {}
@@ -95,7 +92,5 @@ TEST_F(TrayBrightnessTest, DetailedViewVisibilityChangesDuringMaximizeMode) {
   EXPECT_TRUE(tray->visible());
 }
 
-}  // namespace internal
-
 }  // namespace ash