Make it possible to have 1 PpapiGlobals per thread. Update unit tests.

ppapi/proxy/host_dispatcher.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/proxy/host_dispatcher.h"
 
 #include <map>
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 53 matching lines @@
                                PP_Module module,
                                GetInterfaceFunc local_get_interface)
     : Dispatcher(remote_process_handle, local_get_interface),
       pp_module_(module),
       ppb_proxy_(NULL),
       allow_plugin_reentrancy_(false) {
   if (!g_module_to_dispatcher)
     g_module_to_dispatcher = new ModuleToDispatcherMap;
   (*g_module_to_dispatcher)[pp_module_] = this;
 
-  const PPB_Var* var_interface =
-      static_cast<const PPB_Var*>(local_get_interface(PPB_VAR_INTERFACE));
-  SetSerializationRules(new HostVarSerializationRules(var_interface, module));
+  SetSerializationRules(new HostVarSerializationRules(module));
 
   ppb_proxy_ = reinterpret_cast<const PPB_Proxy_Private*>(
       local_get_interface(PPB_PROXY_PRIVATE_INTERFACE));
   DCHECK(ppb_proxy_) << "The proxy interface should always be supported.";
 
   ppb_proxy_->SetReserveInstanceIDCallback(pp_module_, &ReserveInstanceID);
 }
 
 HostDispatcher::~HostDispatcher() {
   g_module_to_dispatcher->erase(pp_module_);
@@ skipping 137 matching lines @@
   dispatcher_ = static_cast<HostDispatcher*>(dispatcher);
   dispatcher_->ppb_proxy()->AddRefModule(dispatcher_->pp_module());
 }
 
 ScopedModuleReference::~ScopedModuleReference() {
   dispatcher_->ppb_proxy()->ReleaseModule(dispatcher_->pp_module());
 }
 
 }  // namespace proxy
 }  // namespace ppapi