Put the Pepper stuff in the content namespace.

content/renderer/pepper/pepper_plugin_delegate_impl.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_DELEGATE_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_DELEGATE_IMPL_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 11 matching lines @@
 #include "content/renderer/pepper/pepper_parent_context_provider.h"
 #include "ppapi/shared_impl/private/ppb_host_resolver_shared.h"
 #include "ppapi/shared_impl/private/ppb_tcp_server_socket_shared.h"
 #include "ppapi/shared_impl/private/tcp_socket_private_impl.h"
 #include "ppapi/shared_impl/private/udp_socket_private_impl.h"
 #include "ui/base/ime/text_input_type.h"
 #include "webkit/plugins/ppapi/plugin_delegate.h"
 #include "webkit/plugins/ppapi/ppb_flash_menu_impl.h"
 
 class FilePath;
-class PepperBrokerImpl;
-class PepperDeviceEnumerationEventHandler;
-class PepperPluginDelegateImpl;
 class RenderViewImpl;
+class TransportDIB;
 
 namespace content {
 class GamepadSharedMemoryReader;
 struct CustomContextMenuContext;
 }
 
 namespace gfx {
 class Point;
 class Rect;
 }
@@ skipping 16 matching lines @@
 }
 
 namespace WebKit {
 class WebFileChooserCompletion;
 class WebGamepads;
 class WebMouseEvent;
 struct WebCompositionUnderline;
 struct WebFileChooserParams;
 }
 
-class TransportDIB;
+
+namespace content {
+
+class PepperBrokerImpl;
+class PepperDeviceEnumerationEventHandler;
+class PepperPluginDelegateImpl;
 
 class PepperPluginDelegateImpl
     : public webkit::ppapi::PluginDelegate,
       public base::SupportsWeakPtr<PepperPluginDelegateImpl>,
       public PepperParentContextProvider,
       public content::RenderViewObserver {

[jam, 2012/03/30 21:50:03]

ditto

  public:
   explicit PepperPluginDelegateImpl(RenderViewImpl* render_view);
   virtual ~PepperPluginDelegateImpl();
 
   // Attempts to create a PPAPI plugin for the given filepath. On success, it
   // will return the newly-created module.
   //
   // There are two reasons for failure. The first is that the plugin isn't
   // a PPAPI plugin. In this case, |*pepper_plugin_was_registered| will be set
   // to false and the caller may want to fall back on creating an NPAPI plugin.
@@ skipping 221 matching lines @@
   virtual bool AddNetworkListObserver(
       webkit_glue::NetworkListObserver* observer) OVERRIDE;
   virtual void RemoveNetworkListObserver(
       webkit_glue::NetworkListObserver* observer) OVERRIDE;
 
   virtual int32_t ShowContextMenu(
       webkit::ppapi::PluginInstance* instance,
       webkit::ppapi::PPB_Flash_Menu_Impl* menu,
       const gfx::Point& position) OVERRIDE;
   void OnContextMenuClosed(
       const content::CustomContextMenuContext& custom_context);

[jam, 2012/03/30 21:50:03]

ditto and below

   void OnCustomContextMenuAction(
       const content::CustomContextMenuContext& custom_context,
       unsigned action);
   void CompleteShowContextMenu(int request_id,
                                bool did_select,
                                unsigned action);
   virtual webkit::ppapi::FullscreenContainer*
       CreateFullscreenContainer(
           webkit::ppapi::PluginInstance* instance) OVERRIDE;
   virtual gfx::Size GetScreenSize() OVERRIDE;
@@ skipping 138 matching lines @@
   // Current text input composition text. Empty if no composition is in
   // progress.
   string16 composition_text_;
 
   // The plugin instance that received the last mouse event. It is set to NULL
   // if the last mouse event went to elements other than Pepper plugins.
   // |last_mouse_event_target_| is not owned by this class. We can know about
   // when it is destroyed via InstanceDeleted().
   webkit::ppapi::PluginInstance* last_mouse_event_target_;
 
   scoped_ptr<content::GamepadSharedMemoryReader> gamepad_shared_memory_reader_;

[jam, 2012/03/30 21:50:03]

ditto

 
   scoped_ptr<PepperDeviceEnumerationEventHandler>
       device_enumeration_event_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperPluginDelegateImpl);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_DELEGATE_IMPL_H_