Corrects mojom::RouteProvider registration in ChildThreadImpl

ipc/ipc_channel_proxy.cc

 // 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.
 
 #include "ipc/ipc_channel_proxy.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
@@ skipping 390 matching lines @@
     const std::string& name,
     const GenericAssociatedInterfaceFactory& factory) {
   base::AutoLock l(channel_lifetime_lock_);
   if (!channel_) {
     base::AutoLock l(pending_filters_lock_);
     pending_interfaces_.emplace_back(name, factory);
     return;
   }
   Channel::AssociatedInterfaceSupport* support =
       channel_->GetAssociatedInterfaceSupport();
-  DCHECK(support);
-  support->AddGenericAssociatedInterface(name, factory);
+  if (support)
+    support->AddGenericAssociatedInterface(name, factory);
 }
 
 void ChannelProxy::Context::SendFromThisThread(Message* message) {
   base::AutoLock l(channel_lifetime_lock_);
   if (!channel_)
     return;
   DCHECK(channel_->IsSendThreadSafe());
   channel_->Send(message);
 }
 
@@ skipping 242 matching lines @@
   return channel->TakeClientFileDescriptor();
 }
 #endif
 
 void ChannelProxy::OnChannelInit() {
 }
 
 //-----------------------------------------------------------------------------
 
 }  // namespace IPC