Unify var tracking between webkit and the proxy.

ppapi/proxy/ppb_input_event_proxy.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/ppb_input_event_proxy.h"
 
 #include "ppapi/c/ppb_audio_config.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/proxy/plugin_var_tracker.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/shared_impl/input_event_impl.h"
+#include "ppapi/shared_impl/var.h"
 #include "ppapi/thunk/thunk.h"
 
 using ppapi::InputEventData;
 using ppapi::InputEventImpl;
 using ppapi::thunk::PPB_InputEvent_API;
 
 namespace pp {
 namespace proxy {
 
 // The implementation is actually in InputEventImpl.
@@ skipping 18 matching lines @@
 }
 
 InputEvent::~InputEvent() {
 }
 
 PPB_InputEvent_API* InputEvent::AsPPB_InputEvent_API() {
   return this;
 }
 
 PP_Var InputEvent::StringToPPVar(const std::string& str) {
-  PP_Var ret;
-  ret.type = PP_VARTYPE_STRING;
-  ret.value.as_id = PluginVarTracker::GetInstance()->MakeString(str);
-  return ret;
+  return ppapi::StringVar::StringToPPVar(0, str);
 }
 
 namespace {
 
 InterfaceProxy* CreateInputEventProxy(Dispatcher* dispatcher,
                                       const void* target_interface) {
   return new PPB_InputEvent_Proxy(dispatcher, target_interface);
 }
 
 }  // namespace
@@ skipping 64 matching lines @@
 }
 
 bool PPB_InputEvent_Proxy::OnMessageReceived(const IPC::Message& msg) {
   // There are no IPC messages for this interface.
   NOTREACHED();
   return false;
 }
 
 }  // namespace proxy
 }  // namespace pp