Eliminate ash::internal namespace

ash/accelerators/accelerator_controller_unittest.cc

Index: ash/accelerators/accelerator_controller_unittest.cc
diff --git a/ash/accelerators/accelerator_controller_unittest.cc b/ash/accelerators/accelerator_controller_unittest.cc
index 5be401ab7cfc178bffe16daaf23cfc5270a7b444..93277eafc08add99af78300ed01b1180649b3470 100644
--- a/ash/accelerators/accelerator_controller_unittest.cc
+++ b/ash/accelerators/accelerator_controller_unittest.cc
@@ -546,12 +546,12 @@ TEST_F(AcceleratorControllerTest, CenterWindowAccelerator) {
   // Add the window to docked container and try to center it.
   window->SetBounds(gfx::Rect(0, 0, 20, 20));
   aura::Window* docked_container = Shell::GetContainer(
-      window->GetRootWindow(), internal::kShellWindowId_DockedContainer);
+      window->GetRootWindow(), kShellWindowId_DockedContainer);
   docked_container->AddChild(window.get());
   gfx::Rect docked_bounds = window->GetBoundsInScreen();
   GetController()->PerformAction(WINDOW_POSITION_CENTER, dummy);
   // It should not get centered and should remain docked.
-  EXPECT_EQ(internal::kShellWindowId_DockedContainer, window->parent()->id());
+  EXPECT_EQ(kShellWindowId_DockedContainer, window->parent()->id());
   EXPECT_EQ(docked_bounds.ToString(), window->GetBoundsInScreen().ToString());
 }