Migrating test/ppapi_file_system to messaging

tests/ppapi_test_lib/get_browser_interface.cc

Index: tests/ppapi_test_lib/get_browser_interface.cc
===================================================================
--- tests/ppapi_test_lib/get_browser_interface.cc	(revision 5661)
+++ tests/ppapi_test_lib/get_browser_interface.cc	(working copy)
@@ -8,6 +8,7 @@
 
 #include "ppapi/c/dev/ppb_context_3d_dev.h"
 #include "ppapi/c/dev/ppb_file_io_dev.h"
+#include "ppapi/c/dev/ppb_file_system_dev.h"
 #include "ppapi/c/dev/ppb_scrollbar_dev.h"
 #include "ppapi/c/dev/ppb_surface_3d_dev.h"
 #include "ppapi/c/dev/ppb_var_deprecated.h"
@@ -89,6 +90,11 @@
       GetBrowserInterface(PPB_FILEIO_DEV_INTERFACE));
 }
 
+const PPB_FileSystem_Dev* PPBFileSystemDev() {
+  return reinterpret_cast<const PPB_FileSystem_Dev*>(
+      GetBrowserInterface(PPB_FILESYSTEM_DEV_INTERFACE));
+}
+
 const PPB_Scrollbar_Dev* PPBScrollbarDev() {
   return  reinterpret_cast<const PPB_Scrollbar_Dev*>(
       GetBrowserInterface(PPB_SCROLLBAR_DEV_INTERFACE));