Eliminate ash::internal namespace

ash/display/display_change_observer_chromeos_unittest.cc

Index: ash/display/display_change_observer_chromeos_unittest.cc
diff --git a/ash/display/display_change_observer_chromeos_unittest.cc b/ash/display/display_change_observer_chromeos_unittest.cc
index f8f6726de587615c4798700831b17e6130aad11e..ca63b0ab1507a6736a384c5f3244f9a91b395700 100644
--- a/ash/display/display_change_observer_chromeos_unittest.cc
+++ b/ash/display/display_change_observer_chromeos_unittest.cc
@@ -16,7 +16,6 @@ using ui::OutputConfigurator;
 typedef testing::Test DisplayChangeObserverTest;
 
 namespace ash {
-namespace internal {
 
 TEST_F(DisplayChangeObserverTest, GetDisplayModeList) {
   ScopedVector<const ui::DisplayMode> modes;
@@ -83,5 +82,4 @@ TEST_F(DisplayChangeObserverTest, GetDisplayModeList) {
   EXPECT_EQ(0u, display_modes.size());
 }
 
-}  // namespace internal
 }  // namespace ash