Implemented shared memory as an NPObject.

o3d/gpu_plugin/np_utils/np_browser_stub.cc

Index: o3d/gpu_plugin/np_utils/np_browser_stub.cc
===================================================================
--- o3d/gpu_plugin/np_utils/np_browser_stub.cc	(revision 25244)
+++ o3d/gpu_plugin/np_utils/np_browser_stub.cc	(working copy)
@@ -103,17 +103,5 @@
 NPObject* StubNPBrowser::GetWindowNPObject(NPP npp) {
   return NULL;
 }
-
-
-NPSharedMemory* StubNPBrowser::MapSharedMemory(NPP id,
-                                        NPObject* object,
-                                        size_t size,
-                                        bool read_only) {
-  return NULL;
-}
-
-void StubNPBrowser::UnmapSharedMemory(NPP id,
-                               NPSharedMemory* shared_memory) {
-}
 }  // namespace gpu_plugin
 }  // namespace o3d