DevTools: migrate from OwnPtr to std::unique_ptr for inspector protocol classes.

third_party/WebKit/Source/platform/inspector_protocol/Backend_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 35 matching lines @@
     {% endif %}
         virtual void {{command.name}}(ErrorString*
     {%- for parameter in command.parameters -%}
         {%- if "optional" in parameter -%}
             , 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 -%}
-            , PassOwnPtr<{{command.name | to_title_case}}Callback> callback
+            , std::unique_ptr<{{command.name | to_title_case}}Callback> callback
     {%- else -%}
       {%- for parameter in command.returns -%}
         {%- if "optional" in parameter -%}
             , 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}}() { }
     };
 {% endfor %}
 };
 
 } // namespace protocol
 } // namespace blink
 
 #endif // !defined({{class_name}}_h)