Convert more interfaces to the new thunk system.

ppapi/thunk/thunk.h

Index: ppapi/thunk/thunk.h
===================================================================
--- ppapi/thunk/thunk.h	(revision 87260)
+++ ppapi/thunk/thunk.h	(working copy)
@@ -12,6 +12,13 @@
 struct PPB_Buffer_Dev;
 struct PPB_CharSet_Dev;
 struct PPB_CursorControl_Dev;
+struct PPB_DirectoryReader_Dev;
+struct PPB_FileChooser_Dev;
+struct PPB_FileIO_Dev;
+struct PPB_FileIOTrusted_Dev;
+struct PPB_FileRef_Dev;
+struct PPB_FileSystem_Dev;
+struct PPB_Find_Dev;
 struct PPB_Font_Dev;
 struct PPB_Graphics2D;
 struct PPB_ImageData;
@@ -26,6 +33,13 @@
 const PPB_Buffer_Dev* GetPPB_Buffer_Thunk();
 const PPB_CharSet_Dev* GetPPB_CharSet_Thunk();
 const PPB_CursorControl_Dev* GetPPB_CursorControl_Thunk();
+const PPB_DirectoryReader_Dev* GetPPB_DirectoryReader_Thunk();
+const PPB_FileChooser_Dev* GetPPB_FileChooser_Thunk();
+const PPB_FileIO_Dev* GetPPB_FileIO_Thunk();
+const PPB_FileIOTrusted_Dev* GetPPB_FileIOTrusted_Thunk();
+const PPB_FileRef_Dev* GetPPB_FileRef_Thunk();
+const PPB_FileSystem_Dev* GetPPB_FileSystem_Thunk();
+const PPB_Find_Dev* GetPPB_Find_Thunk();
 const PPB_Font_Dev* GetPPB_Font_Thunk();
 const PPB_Graphics2D* GetPPB_Graphics2D_Thunk();
 const PPB_ImageData* GetPPB_ImageData_Thunk();