Pepper: Stop using SRPC for irt_open_resource().

ppapi/nacl_irt/manifest_service.h

Index: ppapi/nacl_irt/manifest_service.h
diff --git a/ppapi/nacl_irt/manifest_service.h b/ppapi/nacl_irt/manifest_service.h
index ce414cc0182d5ed17d85faeb60e46e1a2b27fd76..e3d7d1550c8f3bee28ddd1442c7f581d70b18991 100644
--- a/ppapi/nacl_irt/manifest_service.h
+++ b/ppapi/nacl_irt/manifest_service.h
@@ -8,6 +8,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/synchronization/lock.h"
 
 namespace base {
 class MessageLoopProxy;
@@ -36,6 +37,8 @@ class ManifestService {
   scoped_ptr<IPC::ChannelProxy> channel_;
   scoped_refptr<IPC::SyncMessageFilter> filter_;
 
+  base::Lock open_resource_lock_;
+
   DISALLOW_COPY_AND_ASSIGN(ManifestService);
 };