Exclude host-side code from the NaCl IRT proxy build.

ppapi/proxy/ppb_instance_proxy.cc

Index: ppapi/proxy/ppb_instance_proxy.cc
===================================================================
--- ppapi/proxy/ppb_instance_proxy.cc	(revision 161336)
+++ ppapi/proxy/ppb_instance_proxy.cc	(working copy)
@@ -96,10 +96,13 @@
   // This must happen OUTSIDE of ExecuteScript since the SerializedVars use
   // the dispatcher upon return of the function (converting the
   // SerializedVarReturnValue/OutParam to a SerializedVar in the destructor).
+#if !defined(OS_NACL)
   ScopedModuleReference death_grip(dispatcher());
+#endif
 
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PPB_Instance_Proxy, msg)
+#if !defined(OS_NACL)
     // Plugin -> Host messages.
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBInstance_GetWindowObject,
                         OnHostMsgGetWindowObject)
@@ -145,8 +148,6 @@
                         OnHostMsgCancelCompositionText)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBInstance_UpdateSurroundingText,
                         OnHostMsgUpdateSurroundingText)
-
-#if !defined(OS_NACL)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBInstance_ResolveRelativeToDocument,
                         OnHostMsgResolveRelativeToDocument)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBInstance_DocumentCanRequest,
@@ -686,6 +687,7 @@
       API_ID_PPB_INSTANCE, instance, text, caret, anchor));
 }
 
+#if !defined(OS_NACL)
 void PPB_Instance_Proxy::OnHostMsgGetWindowObject(
     PP_Instance instance,
     SerializedVarReturnValue result) {
@@ -1026,6 +1028,7 @@
                                              anchor);
   }
 }
+#endif  // !defined(OS_NACL)
 
 void PPB_Instance_Proxy::OnPluginMsgMouseLockComplete(PP_Instance instance,
                                                       int32_t result) {
@@ -1041,11 +1044,13 @@
   TrackedCallback::ClearAndRun(&(data->mouse_lock_callback), result);
 }
 
+#if !defined(OS_NACL)
 void PPB_Instance_Proxy::MouseLockCompleteInHost(int32_t result,
                                                  PP_Instance instance) {
   dispatcher()->Send(new PpapiMsg_PPBInstance_MouseLockComplete(
       API_ID_PPB_INSTANCE, instance, result));
 }
+#endif  // !defined(OS_NACL)
 
 void PPB_Instance_Proxy::CancelAnyPendingRequestSurroundingText(
     PP_Instance instance) {