Lift the 64K message size limit for postMessage to/from NativeClient.

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_file_ref.cc

Index: ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_file_ref.cc
===================================================================
--- ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_file_ref.cc	(revision 117568)
+++ ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_file_ref.cc	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
@@ -89,7 +89,7 @@
   DebugPrintf("PPB_FileRef::GetName: file_ref=%"NACL_PRIu32"\n", file_ref);
 
   PP_Var name = PP_MakeUndefined();
-  nacl_abi_size_t length = kMaxVarSize;
+  nacl_abi_size_t length = kMaxReturnVarSize;
   nacl::scoped_array<char> name_bytes(new char[length]);
   NaClSrpcError srpc_result = PpbFileRefRpcClient::PPB_FileRef_GetName(
       GetMainSrpcChannel(),
@@ -109,7 +109,7 @@
   DebugPrintf("PPB_FileRef::GetPath: file_ref=%"NACL_PRIu32"\n", file_ref);
 
   PP_Var path = PP_MakeUndefined();
-  nacl_abi_size_t length = kMaxVarSize;
+  nacl_abi_size_t length = kMaxReturnVarSize;
   nacl::scoped_array<char> path_bytes(new char[length]);
   NaClSrpcError srpc_result = PpbFileRefRpcClient::PPB_FileRef_GetPath(
       GetMainSrpcChannel(),