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

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

Index: ppapi/native_client/src/shared/ppapi_proxy/browser_ppp_selection.cc
===================================================================
--- ppapi/native_client/src/shared/ppapi_proxy/browser_ppp_selection.cc	(revision 117568)
+++ ppapi/native_client/src/shared/ppapi_proxy/browser_ppp_selection.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.
 
@@ -26,8 +26,8 @@
   DebugPrintf("PPP_Selection_Dev::GetSelectedText: "
               "instance=%"NACL_PRIu32"\n", instance);
   NaClSrpcChannel* channel = GetMainSrpcChannel(instance);
-  nacl_abi_size_t text_size = kMaxVarSize;
-  nacl::scoped_array<char> text_bytes(new char[kMaxVarSize]);
+  nacl_abi_size_t text_size = kMaxReturnVarSize;
+  nacl::scoped_array<char> text_bytes(new char[text_size]);
   NaClSrpcError srpc_result =
       PppSelectionRpcClient::PPP_Selection_GetSelectedText(
           channel,
@@ -56,4 +56,3 @@
 }
 
 }  // namespace ppapi_proxy
-