Remove extraneous namespaces

mojo/examples/window_manager/debug_panel.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_EXAMPLES_WINDOW_MANAGER_DEBUG_PANEL_H_
 #define MOJO_EXAMPLES_WINDOW_MANAGER_DEBUG_PANEL_H_
 
 #include <string>
 
 #include "mojo/public/interfaces/service_provider/service_provider.mojom.h"
@@ skipping 23 matching lines @@
 }
 
 // A panel of controls intended to demonstrate the functionality of the window
 // manager.
 class DebugPanel : public views::LayoutManager, public views::ButtonListener {
  public:
   class Delegate {
    public:
     virtual void CloseTopWindow() = 0;
     virtual void RequestNavigate(
-        uint32 source_node_id, navigation::Target target,
-        navigation::NavigationDetailsPtr nav_details) = 0;
+        uint32 source_node_id, Target target,
+        NavigationDetailsPtr nav_details) = 0;
    protected:
     virtual ~Delegate(){}
   };
 
   DebugPanel(Delegate* delegate, view_manager::Node* node);
   virtual ~DebugPanel();
 
-  navigation::Target navigation_target() const;
+  Target navigation_target() const;
 
  private:
   // LayoutManager overrides:
   virtual gfx::Size GetPreferredSize(const views::View* view) const OVERRIDE;
   virtual void Layout(views::View* host) OVERRIDE;
   virtual void ButtonPressed(views::Button* sender,
                              const ui::Event& event) OVERRIDE;
 
   void Navigate(const std::string& url);
 
@@ skipping 10 matching lines @@
   views::Button* close_last_;
   views::Button* cross_app_;
 
   DISALLOW_COPY_AND_ASSIGN(DebugPanel);
 };
 
 }  // examples
 }  // mojo
 
 #endif  //  MOJO_EXAMPLES_WINDOW_MANAGER_DEBUG_PANEL_H_