Convert more interfaces to the new thunk system. This goes up to and including

webkit/plugins/ppapi/ppb_directory_reader_impl.h

Index: webkit/plugins/ppapi/ppb_directory_reader_impl.h
===================================================================
--- webkit/plugins/ppapi/ppb_directory_reader_impl.h	(revision 87442)
+++ webkit/plugins/ppapi/ppb_directory_reader_impl.h	(working copy)
@@ -8,6 +8,7 @@
 #include <queue>
 
 #include "base/file_util_proxy.h"
+#include "ppapi/thunk/ppb_directory_reader_api.h"
 #include "webkit/plugins/ppapi/resource.h"
 
 struct PP_CompletionCallback;
@@ -19,22 +20,26 @@
 
 class PPB_FileRef_Impl;
 
-class PPB_DirectoryReader_Impl : public Resource {
+class PPB_DirectoryReader_Impl
+    : public Resource,
+      public ::ppapi::thunk::PPB_DirectoryReader_API {
  public:
   explicit PPB_DirectoryReader_Impl(PPB_FileRef_Impl* directory_ref);
   virtual ~PPB_DirectoryReader_Impl();
 
-  // Returns a pointer to the interface implementing PPB_DirectoryReader that
-  // is exposed to the plugin.
-  static const PPB_DirectoryReader_Dev* GetInterface();
+  static PP_Resource Create(PP_Resource directory_ref);
 
   // Resource overrides.
-  virtual PPB_DirectoryReader_Impl* AsPPB_DirectoryReader_Impl();
+  virtual PPB_DirectoryReader_Impl* AsPPB_DirectoryReader_Impl() OVERRIDE;
 
-  // PPB_DirectoryReader implementation.
-  int32_t GetNextEntry(PP_DirectoryEntry_Dev* entry,
-                       PP_CompletionCallback callback);
+  // ResourceObjectBase overrides.
+  virtual ::ppapi::thunk::PPB_DirectoryReader_API* AsPPB_DirectoryReader_API()
+      OVERRIDE;
 
+  // PPB_DirectoryReader_API implementation.
+  virtual int32_t GetNextEntry(PP_DirectoryEntry_Dev* entry,
+                               PP_CompletionCallback callback) OVERRIDE;
+
   void AddNewEntries(const std::vector<base::FileUtilProxy::Entry>& entries,
                      bool has_more);