IDL: Drop [PerContextEnabled] extended attribute

Source/bindings/templates/methods.cpp

 {% from 'conversions.cpp' import declare_enum_validation_variable, v8_value_to_local_cpp_value %}
 
 
 {##############################################################################}
 {% macro generate_method(method, world_suffix) %}
 {% filter conditional(method.conditional_string) %}
 {% if method.returns_promise and method.has_exception_state %}
 static void {{method.name}}{{method.overload_index}}Method{{world_suffix}}Promise(const v8::FunctionCallbackInfo<v8::Value>& info, ExceptionState& exceptionState)
 {% else %}
 static void {{method.name}}{{method.overload_index}}Method{{world_suffix}}(const v8::FunctionCallbackInfo<v8::Value>& info)
@@ skipping 613 matching lines @@
 {% set only_exposed_to_private_script = 'V8DOMConfiguration::OnlyExposedToPrivateScript' if method.only_exposed_to_private_script else 'V8DOMConfiguration::ExposedToAllScripts' %}
 const V8DOMConfiguration::MethodConfiguration {{method.name}}MethodConfiguration = {
     "{{method.name}}", {{method_callback}}, {{method_callback_for_main_world}}, {{method_length}}, {{only_exposed_to_private_script}},
 };
 V8DOMConfiguration::installMethod(isolate, {{method.function_template}}, {{method.signature}}, {{property_attribute}}, {{method.name}}MethodConfiguration);
 {%- endmacro %}
 
 {######################################}
 {% macro install_conditionally_enabled_methods() %}
 {% if conditionally_enabled_methods %}
-{# Define per-context enabled operations #}
+{# Define operations with limited exposure #}
 v8::Local<v8::Signature> defaultSignature = v8::Signature::New(isolate, domTemplate(isolate));
 ExecutionContext* context = toExecutionContext(prototypeObject->CreationContext());
 ASSERT(context);
 {% for method in conditionally_enabled_methods %}
-{% filter per_context_enabled(method.overloads.per_context_enabled_function_all
-                              if method.overloads else
-                              method.per_context_enabled_function) %}
 {% filter exposed(method.overloads.exposed_test_all
                   if method.overloads else
                   method.exposed_test) %}
 {% filter runtime_enabled(method.overloads.runtime_enabled_function_all
                           if method.overloads else
                           method.runtime_enabled_function) %}
 prototypeObject->Set(v8AtomicString(isolate, "{{method.name}}"), v8::FunctionTemplate::New(isolate, {{cpp_class_or_partial}}V8Internal::{{method.name}}MethodCallback, v8Undefined(), defaultSignature, {{method.number_of_required_arguments}})->GetFunction(isolate->GetCurrentContext()).ToLocalChecked());
 {% endfilter %}{# runtime_enabled() #}
 {% endfilter %}{# exposed() #}
-{% endfilter %}{# per_context_enabled() #}
 {% endfor %}
 {% endif %}
 {%- endmacro %}