[inspector_protocol] always use weak pointer in DispatcherImpl::{command.name}

templates/TypeBuilder_cpp.template

 // This file is generated
 
 // Copyright (c) 2016 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 {{format_include(config.protocol.package, domain.domain)}}
 
 #include {{format_include(config.protocol.package, "Protocol")}}
 
@@ skipping 337 matching lines @@
         {% endfor %}
     }
     if (weak->get())
         weak->get()->sendResponse(callId, response, std::move(result));
       {% else %}
     if (weak->get())
         weak->get()->sendResponse(callId, response);
       {% endif %}
     return response.status();
     {% else %}
+    std::unique_ptr<DispatcherBase::WeakPtr> weak = weakPtr();
     std::unique_ptr<{{command.name | to_title_case}}CallbackImpl> callback(new {{command.name | to_title_case}}CallbackImpl(weakPtr(), callId, nextCallbackId()));
     m_backend->{{command.name | to_method_case}}(
       {%- for property in command.parameters -%}
         {%- if not loop.first -%}, {% endif -%}
         {%- if "optional" in property -%}
         std::move(in_{{property.name}})
         {%- else -%}
         {{resolve_type(property).to_pass_type % ("in_" + property.name)}}
         {%- endif -%}
       {%- endfor -%}
         {%- if command.parameters -%}, {% endif -%}
         std::move(callback));
-    return lastCallbackFallThrough() ? DispatchResponse::kFallThrough : DispatchResponse::kAsync;
+    return (weak->get() && weak->get()->lastCallbackFallThrough()) ? DispatchResponse::kFallThrough : DispatchResponse::kAsync;
     {% endif %}
 }
   {% endfor %}
 
 // static
 void Dispatcher::wire(UberDispatcher* dispatcher, Backend* backend)
 {
     dispatcher->registerBackend("{{domain.domain}}", std::unique_ptr<protocol::DispatcherBase>(new DispatcherImpl(dispatcher->channel(), backend, dispatcher->fallThroughForNotFound())));
 }
 
 } // {{domain.domain}}
 {% for namespace in config.protocol.namespace %}
 } // namespace {{namespace}}
 {% endfor %}