Bug 781256 - 'Share FileDescriptors across processes in preparation for OS-level sandbox'. r=khuey+cjones.

dom/plugins/ipc/PluginModuleParent.cpp

@@ -689,9 +689,8 @@ PluginModuleParent::RecvBackUpXResources(const FileDescriptor& aXSocketFd)
 #else
     NS_ABORT_IF_FALSE(0 > mPluginXSocketFdDup.get(),
                       "Already backed up X resources??");
-    int fd = aXSocketFd.fd; // Copy to discard |const| qualifier
     mPluginXSocketFdDup.forget();
-    mPluginXSocketFdDup.reset(fd);
+    mPluginXSocketFdDup.reset(aXSocketFd.PlatformHandle());
 #endif
     return true;
 }