Put the Pepper stuff in the content namespace.

content/renderer/pepper/pepper_plugin_delegate_impl.h

Index: content/renderer/pepper/pepper_plugin_delegate_impl.h
diff --git a/content/renderer/pepper/pepper_plugin_delegate_impl.h b/content/renderer/pepper/pepper_plugin_delegate_impl.h
index 5ee07afe15294a1d887b37d99d252df29737bca3..0934df8919e1e959a3d46586701b21d2bd666feb 100644
--- a/content/renderer/pepper/pepper_plugin_delegate_impl.h
+++ b/content/renderer/pepper/pepper_plugin_delegate_impl.h
@@ -29,15 +29,8 @@
 #include "webkit/plugins/ppapi/ppb_flash_menu_impl.h"
 
 class FilePath;
-class PepperBrokerImpl;
-class PepperDeviceEnumerationEventHandler;
-class PepperPluginDelegateImpl;
 class RenderViewImpl;
-
-namespace content {
-class GamepadSharedMemoryReader;
-struct CustomContextMenuContext;
-}
+class TransportDIB;
 
 namespace gfx {
 class Point;
@@ -69,13 +62,19 @@ struct WebCompositionUnderline;
 struct WebFileChooserParams;
 }
 
-class TransportDIB;
+namespace content {
+
+struct CustomContextMenuContext;
+class GamepadSharedMemoryReader;
+class PepperBrokerImpl;
+class PepperDeviceEnumerationEventHandler;
+class PepperPluginDelegateImpl;
 
 class PepperPluginDelegateImpl
     : public webkit::ppapi::PluginDelegate,
       public base::SupportsWeakPtr<PepperPluginDelegateImpl>,
       public PepperParentContextProvider,
-      public content::RenderViewObserver {
+      public RenderViewObserver {
  public:
   explicit PepperPluginDelegateImpl(RenderViewImpl* render_view);
   virtual ~PepperPluginDelegateImpl();
@@ -317,9 +316,9 @@ class PepperPluginDelegateImpl
       webkit::ppapi::PPB_Flash_Menu_Impl* menu,
       const gfx::Point& position) OVERRIDE;
   void OnContextMenuClosed(
-      const content::CustomContextMenuContext& custom_context);
+      const CustomContextMenuContext& custom_context);
   void OnCustomContextMenuAction(
-      const content::CustomContextMenuContext& custom_context,
+      const CustomContextMenuContext& custom_context,
       unsigned action);
   void CompleteShowContextMenu(int request_id,
                                bool did_select,
@@ -477,7 +476,7 @@ class PepperPluginDelegateImpl
   // when it is destroyed via InstanceDeleted().
   webkit::ppapi::PluginInstance* last_mouse_event_target_;
 
-  scoped_ptr<content::GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
+  scoped_ptr<GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
 
   scoped_ptr<PepperDeviceEnumerationEventHandler>
       device_enumeration_event_handler_;
@@ -485,4 +484,6 @@ class PepperPluginDelegateImpl
   DISALLOW_COPY_AND_ASSIGN(PepperPluginDelegateImpl);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_DELEGATE_IMPL_H_