Fix a chrome browser crash observed in chrome frame reliability test runs. Th...

ipc/ipc_channel_proxy.cc

 // Copyright (c) 2006-2008 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 "base/message_loop.h"
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/thread.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_logging.h"
@@ skipping 137 matching lines @@
   delete channel_;
   channel_ = NULL;
 
   // Balance with the reference taken during startup.  This may result in
   // self-destruction.
   Release();
 }
 
 // Called on the IPC::Channel thread
 void ChannelProxy::Context::OnSendMessage(Message* message) {
+  if (!channel_) {
+    delete message;
+    OnChannelClosed();
+    return;
+  }
   if (!channel_->Send(message))
     OnChannelError();
 }
 
 // Called on the IPC::Channel thread
 void ChannelProxy::Context::OnAddFilter(MessageFilter* filter) {
   filters_.push_back(filter);
 
   // If the channel has already been created, then we need to send this message
   // so that the filter gets access to the Channel.
@@ skipping 139 matching lines @@
 int ChannelProxy::GetClientFileDescriptor() const {
   Channel *channel = context_.get()->channel_;
   DCHECK(channel); // Channel must have been created first.
   return channel->GetClientFileDescriptor();
 }
 #endif
 
 //-----------------------------------------------------------------------------
 
 }  // namespace IPC