DevTools: consistently use Maybe for optional values in the protocol generator.

third_party/WebKit/Source/platform/inspector_protocol/Dispatcher_h.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.
 
 #ifndef {{class_name}}_h
 #define {{class_name}}_h
 
 #include "platform/inspector_protocol/TypeBuilder.h"
@@ skipping 37 matching lines @@
   {% for command in domain.commands %}
     {% if "redirect" in command %}{% continue %}{% endif %}
     {% if ("handlers" in command) and not ("renderer" in command["handlers"]) %}{% continue %}{% endif %}
     {% if "async" in command %}
         class PLATFORM_EXPORT {{command.name | to_title_case}}Callback : public CallbackBase {
         public:
             {{command.name | to_title_case}}Callback(PassRefPtr<DispatcherImpl>, int sessionId, int id);
             void sendSuccess(
             {%- for parameter in command.returns -%}
               {%- if "optional" in parameter -%}
-                {{resolve_type(parameter).optional_pass_type}} {{parameter.name}}
+                const Maybe<{{resolve_type(parameter).raw_type}}>& {{parameter.name}}
               {%- else -%}
                 {{resolve_type(parameter).pass_type}} {{parameter.name}}
               {%- endif -%}
               {%- if not loop.last -%}, {% endif -%}
             {%- endfor -%}
             );
         };
     {% endif %}
         virtual void {{command.name}}(ErrorString*
     {%- for parameter in command.parameters -%}
         {%- if "optional" in parameter -%}
-            , {{resolve_type(parameter).optional_pass_type}} in_{{parameter.name}}
+            , const Maybe<{{resolve_type(parameter).raw_type}}>& in_{{parameter.name}}
         {%- else -%}
             , {{resolve_type(parameter).pass_type}} in_{{parameter.name}}
         {%- endif -%}
     {%- endfor -%}
     {%- if "async" in command -%}
             , PassRefPtr<{{command.name | to_title_case}}Callback> callback
     {%- else -%}
       {%- for parameter in command.returns -%}
         {%- if "optional" in parameter -%}
-            , {{resolve_type(parameter).optional_type}}* out_{{parameter.name}}
+            , Maybe<{{resolve_type(parameter).raw_type}}>* out_{{parameter.name}}
         {%- else -%}
             , {{resolve_type(parameter).type}}* out_{{parameter.name}}
         {%- endif -%}
       {%- endfor -%}
     {%- endif -%}
         ) = 0;
   {% endfor %}
 
     protected:
         virtual ~{{domain.domain}}CommandHandler() { }
@@ skipping 21 matching lines @@
     virtual void dispatch(int sessionId, const String& message) = 0;
     static bool getCommandName(const String& message, String* result);
 };
 
 } // namespace protocol
 } // namespace blink
 
 using blink::protocol::ErrorString;
 
 #endif // !defined({{class_name}}_h)