Convert the pp::proxy namespace to the ppapi::proxy namespace.

ppapi/proxy/ppb_flash_menu_proxy.h

Index: ppapi/proxy/ppb_flash_menu_proxy.h
diff --git a/ppapi/proxy/ppb_flash_menu_proxy.h b/ppapi/proxy/ppb_flash_menu_proxy.h
index adce7ecaa7578efa6bc05980088cab22b3e6bc4b..869a7d66a78d3fad4b202717de087cd693464582 100644
--- a/ppapi/proxy/ppb_flash_menu_proxy.h
+++ b/ppapi/proxy/ppb_flash_menu_proxy.h
@@ -13,10 +13,9 @@ struct PP_Point;
 struct PPB_Flash_Menu;
 
 namespace ppapi {
+
 class HostResource;
-}
 
-namespace pp {
 namespace proxy {
 
 class SerializedFlashMenu;
@@ -47,11 +46,11 @@ class PPB_Flash_Menu_Proxy : public InterfaceProxy {
                     int32_t result);
   void SendShowACKToPlugin(int32_t result, ShowRequest* request);
 
-  CompletionCallbackFactory<PPB_Flash_Menu_Proxy,
-                            ProxyNonThreadSafeRefCount> callback_factory_;
+  pp::CompletionCallbackFactory<PPB_Flash_Menu_Proxy,
+                                ProxyNonThreadSafeRefCount> callback_factory_;
 };
 
 }  // namespace proxy
-}  // namespace pp
+}  // namespace ppapi
 
 #endif  // PPAPI_PPB_FLASH_MENU_PROXY_H_