Eliminate ash::internal namespace

ash/wm/panels/panel_window_resizer.cc

Index: ash/wm/panels/panel_window_resizer.cc
diff --git a/ash/wm/panels/panel_window_resizer.cc b/ash/wm/panels/panel_window_resizer.cc
index 29803e821ed79ce2fbc58b38ee981f2bfbbb8231..14632b608c3d0006f81593eef11c87996da0d7b0 100644
--- a/ash/wm/panels/panel_window_resizer.cc
+++ b/ash/wm/panels/panel_window_resizer.cc
@@ -32,11 +32,9 @@ namespace ash {
 namespace {
 const int kPanelSnapToLauncherDistance = 30;
 
-internal::PanelLayoutManager* GetPanelLayoutManager(
-    aura::Window* panel_container) {
-  DCHECK(panel_container->id() == internal::kShellWindowId_PanelContainer);
-  return static_cast<internal::PanelLayoutManager*>(
-      panel_container->layout_manager());
+PanelLayoutManager* GetPanelLayoutManager(aura::Window* panel_container) {
+  DCHECK(panel_container->id() == kShellWindowId_PanelContainer);
+  return static_cast<PanelLayoutManager*>(panel_container->layout_manager());
 }
 
 }  // namespace
@@ -74,8 +72,8 @@ void PanelWindowResizer::Drag(const gfx::Point& location, int event_flags) {
       GetPanelLayoutManager(panel_container_)->FinishDragging();
     aura::Window* dst_root = Shell::GetInstance()->display_controller()->
         GetRootWindowForDisplayId(dst_display.id());
-    panel_container_ = Shell::GetContainer(
-        dst_root, internal::kShellWindowId_PanelContainer);
+    panel_container_ =
+        Shell::GetContainer(dst_root, kShellWindowId_PanelContainer);
 
     // The panel's parent already knows that the drag is in progress for this
     // panel.
@@ -124,9 +122,8 @@ PanelWindowResizer::PanelWindowResizer(WindowResizer* next_window_resizer,
       was_attached_(window_state->panel_attached()),
       weak_ptr_factory_(this) {
   DCHECK(details().is_resizable);
-  panel_container_ = Shell::GetContainer(
-      GetTarget()->GetRootWindow(),
-      internal::kShellWindowId_PanelContainer);
+  panel_container_ = Shell::GetContainer(GetTarget()->GetRootWindow(),
+                                         kShellWindowId_PanelContainer);
   initial_panel_container_ = panel_container_;
 }
 
@@ -134,7 +131,7 @@ bool PanelWindowResizer::AttachToLauncher(const gfx::Rect& bounds,
                                           gfx::Point* offset) {
   bool should_attach = false;
   if (panel_container_) {
-    internal::PanelLayoutManager* panel_layout_manager =
+    PanelLayoutManager* panel_layout_manager =
         GetPanelLayoutManager(panel_container_);
     gfx::Rect launcher_bounds = ScreenUtil::ConvertRectFromScreen(
         GetTarget()->parent(),