[inspector_protocol] Support chromium code style.

templates/Imported_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 {{"_".join(config.protocol.namespace)}}_{{domain.domain}}_imported_h
 #define {{"_".join(config.protocol.namespace)}}_{{domain.domain}}_imported_h
 
-#include "{{config.protocol.package}}/Protocol.h"
-#include {{format_include(config.imported.header if config.imported.header else "\"%s/%s.h\"" % (config.imported.package, domain.domain))}}
+#include {{format_include(config.protocol.package, "Protocol")}}
+{% if config.imported.header %}
+#include {{format_include(config.imported.header)}}
+{% else %}
+#include {{format_include(config.imported.package, domain.domain)}}
+{% endif %}
 
 {% for namespace in config.protocol.namespace %}
 namespace {{namespace}} {
 {% endfor %}
   {% for type in domain.types %}
     {% if not (type.type == "object") or not ("properties" in type) or not (type.exported) %}{% continue %}{% endif %}
 
 template<>
 struct ValueConversions<{{"::".join(config.imported.namespace)}}::{{domain.domain}}::API::{{type.id}}> {
     static std::unique_ptr<{{"::".join(config.imported.namespace)}}::{{domain.domain}}::API::{{type.id}}> parse(protocol::Value* value, ErrorSupport* errors)
@@ skipping 20 matching lines @@
         return serialize(value.get());
     }
 };
   {% endfor %}
 
 {% for namespace in config.protocol.namespace %}
 } // namespace {{namespace}}
 {% endfor %}
 
 #endif // !defined({{"_".join(config.protocol.namespace)}}_{{domain.domain}}_imported_h)