Pepper proxy: make the browser sender handle the proxy lock properly.

ppapi/proxy/ppb_udp_socket_private_proxy.cc

Index: ppapi/proxy/ppb_udp_socket_private_proxy.cc
diff --git a/ppapi/proxy/ppb_udp_socket_private_proxy.cc b/ppapi/proxy/ppb_udp_socket_private_proxy.cc
index b5a6d93d52ad7b1b3af61d791790e08d699e48e2..3f76e41f933e7945f1773c75e1de2556299696dd 100644
--- a/ppapi/proxy/ppb_udp_socket_private_proxy.cc
+++ b/ppapi/proxy/ppb_udp_socket_private_proxy.cc
@@ -10,7 +10,6 @@
 #include "ppapi/c/private/ppb_udp_socket_private.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/plugin_globals.h"
-#include "ppapi/proxy/plugin_proxy_delegate.h"
 #include "ppapi/proxy/plugin_resource_tracker.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/shared_impl/private/udp_socket_private_impl.h"
@@ -84,7 +83,7 @@ void UDPSocket::SendClose() {
 }
 
 void UDPSocket::SendToBrowser(IPC::Message* msg) {
-  PluginGlobals::Get()->plugin_proxy_delegate()->SendToBrowser(msg);
+  PluginGlobals::Get()->GetBrowserSender()->Send(msg);
 }
 
 }  // namespace
@@ -106,7 +105,7 @@ PP_Resource PPB_UDPSocket_Private_Proxy::CreateProxyResource(
     return 0;
 
   uint32 socket_id = 0;
-  PluginGlobals::Get()->plugin_proxy_delegate()->SendToBrowser(
+  PluginGlobals::Get()->GetBrowserSender()->Send(
       new PpapiHostMsg_PPBUDPSocket_Create(
           API_ID_PPB_UDPSOCKET_PRIVATE, dispatcher->plugin_dispatcher_id(),
           &socket_id));