[DevTools] Dont pass errorString to async protocol methods

third_party/WebKit/Source/platform/inspector_protocol/TypeBuilder_h.template

Index: third_party/WebKit/Source/platform/inspector_protocol/TypeBuilder_h.template
diff --git a/third_party/WebKit/Source/platform/inspector_protocol/TypeBuilder_h.template b/third_party/WebKit/Source/platform/inspector_protocol/TypeBuilder_h.template
index 1bbc6197d496adcaf974c209dfb610c7a9818558..83310065e0f0dab291dcff167ed7177dd062dfbb 100644
--- a/third_party/WebKit/Source/platform/inspector_protocol/TypeBuilder_h.template
+++ b/third_party/WebKit/Source/platform/inspector_protocol/TypeBuilder_h.template
@@ -214,16 +214,21 @@ public:
         ) = 0;
     };
     {% endif %}
-    virtual void {{command.name}}(ErrorString*
+    virtual void {{command.name}}(
+    {%- if not("async" in command) -%}
+        ErrorString*
+    {%- endif -%}
     {%- for parameter in command.parameters -%}
+        {%- if (not loop.first) or not("async" in command) -%}, {% endif -%}
         {%- if "optional" in parameter -%}
-        , const Maybe<{{resolve_type(parameter).raw_type}}>& in_{{parameter.name}}
+        const Maybe<{{resolve_type(parameter).raw_type}}>& in_{{parameter.name}}
         {%- else -%}
-        , {{resolve_type(parameter).pass_type}} in_{{parameter.name}}
+        {{resolve_type(parameter).pass_type}} in_{{parameter.name}}
         {%- endif -%}
     {%- endfor -%}
     {%- if "async" in command -%}
-        , std::unique_ptr<{{command.name | to_title_case}}Callback> callback
+        {%- if command.parameters -%}, {% endif -%}
+        std::unique_ptr<{{command.name | to_title_case}}Callback> callback
     {%- else -%}
       {%- for parameter in command.returns -%}
         {%- if "optional" in parameter -%}