Mojo cpp bindings: remove redundant validation in Decode*().

mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl

 {%- import "interface_macros.tmpl" as interface_macros %}
 {%- set class_name = interface.name %}
 {%- set proxy_name = interface.name ~ "Proxy" %}
 {%- set namespace_as_string = "%s"|format(namespace|replace(".","::")) %}
 
 {%- macro alloc_params(parameters) %}
 {%-   for param in parameters %}
 {%-     if param.kind|is_object_kind  %}
 {{param.kind|cpp_result_type}} p{{loop.index}};
 Deserialize_(params->{{param.name}}.ptr, &p{{loop.index}});
@@ skipping 82 matching lines @@
  private:
   {{interface_macros.declare_callback(method)}} callback_;
   MOJO_DISALLOW_COPY_AND_ASSIGN({{class_name}}_{{method.name}}_ForwardToCallback);
 };
 bool {{class_name}}_{{method.name}}_ForwardToCallback::Accept(
     mojo::Message* message) {
   internal::{{class_name}}_{{method.name}}_ResponseParams_Data* params =
       reinterpret_cast<internal::{{class_name}}_{{method.name}}_ResponseParams_Data*>(
           message->mutable_payload());
 
-  if (!params->DecodePointersAndHandles(message))
-    return false;
+  params->DecodePointersAndHandles(message->mutable_handles());
   {{alloc_params(method.response_parameters)|indent(2)}}
   callback_.Run({{pass_params(method.response_parameters)}});
   return true;
 }
 {%-   endif %}
 {%- endfor %}
 
 {{proxy_name}}::{{proxy_name}}(mojo::MessageReceiverWithResponder* receiver)
     : receiver_(receiver) {
 }
@@ skipping 83 matching lines @@
 bool {{class_name}}Stub::Accept(mojo::Message* message) {
 {%- if interface.methods %}
   switch (message->header()->name) {
 {%-   for method in interface.methods %}
     case internal::k{{class_name}}_{{method.name}}_Name: {
 {%-     if method.response_parameters == None %}
       internal::{{class_name}}_{{method.name}}_Params_Data* params =
           reinterpret_cast<internal::{{class_name}}_{{method.name}}_Params_Data*>(
               message->mutable_payload());
 
-      if (!params->DecodePointersAndHandles(message))
-        return false;
+      params->DecodePointersAndHandles(message->mutable_handles());
       {{alloc_params(method.parameters)|indent(6)}}
       sink_->{{method.name}}({{pass_params(method.parameters)}});
       return true;
 {%-     else %}
       break;
 {%-     endif %}
     }
 {%-   endfor %}
   }
 {%- endif %}
   return false;
 }
 
 bool {{class_name}}Stub::AcceptWithResponder(
     mojo::Message* message, mojo::MessageReceiver* responder) {
 {%- if interface.methods %}
   switch (message->header()->name) {
 {%-   for method in interface.methods %}
     case internal::k{{class_name}}_{{method.name}}_Name: {
 {%-     if method.response_parameters != None %}
       internal::{{class_name}}_{{method.name}}_Params_Data* params =
           reinterpret_cast<internal::{{class_name}}_{{method.name}}_Params_Data*>(
               message->mutable_payload());
 
-      if (!params->DecodePointersAndHandles(message))
-        return false;
+      params->DecodePointersAndHandles(message->mutable_handles());
       {{interface_macros.declare_callback(method)}}::Runnable* runnable =
           new {{class_name}}_{{method.name}}_ProxyToResponder(
               message->request_id(), responder);
       {{interface_macros.declare_callback(method)}} callback(runnable);
       {{alloc_params(method.parameters)|indent(6)}}
       sink_->{{method.name}}(
 {%- if method.parameters -%}{{pass_params(method.parameters)}}, {% endif -%}callback);
       return true;
 {%-     else %}
       break;
@@ skipping 63 matching lines @@
       }
       break;
     }
 {%-   endfor %}
   }
 {%- endif %}
 
   return sink_->Accept(message);
 }
 {%- endif -%}