Eliminate ash::internal namespace

ash/wm/workspace/workspace_window_resizer.h

Index: ash/wm/workspace/workspace_window_resizer.h
diff --git a/ash/wm/workspace/workspace_window_resizer.h b/ash/wm/workspace/workspace_window_resizer.h
index c16744addae3c6d9f633e5f0cd5de61eccde8914..d7d57d08703e7b9dfe80e2b99d80a57d5712c979 100644
--- a/ash/wm/workspace/workspace_window_resizer.h
+++ b/ash/wm/workspace/workspace_window_resizer.h
@@ -17,17 +17,15 @@
 #include "ui/aura/window_tracker.h"
 
 namespace ash {
-namespace wm {
-class WindowState;
-}
-
-namespace internal {
-
 class DockedWindowLayoutManager;
 class PhantomWindowController;
 class TwoStepEdgeCycler;
 class WindowSize;
 
+namespace wm {
+class WindowState;
+}
+
 // WindowResizer implementation for workspaces. This enforces that windows are
 // not allowed to vertically move or resize outside of the work area. As windows
 // are moved outside the work area they are shrunk. We remember the height of
@@ -222,7 +220,6 @@ class ASH_EXPORT WorkspaceWindowResizer : public WindowResizer {
   DISALLOW_COPY_AND_ASSIGN(WorkspaceWindowResizer);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WINDOW_RESIZER_H_