Make V8Binding helpers return LocalFrame/LocalDOMWindow as appropriate

third_party/WebKit/Source/bindings/templates/interface_base.cpp.tmpl

 {% filter format_blink_cpp_source_code %}
 
 {% include 'copyright_block.txt' %}
 #include "{{v8_class_or_partial}}.h"
 
 {% for filename in cpp_includes if filename != '%s.h' % cpp_class_or_partial %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
@@ skipping 226 matching lines @@
 
 {% if has_access_check_callbacks and not is_partial %}
 bool {{v8_class_or_partial}}::securityCheck(v8::Local<v8::Context> accessingContext, v8::Local<v8::Object> accessedObject, v8::Local<v8::Value> data) {
   {% if interface_name == 'Window' %}
   v8::Isolate* isolate = v8::Isolate::GetCurrent();
   v8::Local<v8::Object> window = V8Window::findInstanceInPrototypeChain(accessedObject, isolate);
   if (window.IsEmpty())
     return false;  // the frame is gone.
 
   const DOMWindow* targetWindow = V8Window::toImpl(window);
-  return BindingSecurity::shouldAllowAccessTo(toLocalDOMWindow(toDOMWindow(accessingContext)), targetWindow, BindingSecurity::ErrorReportOption::DoNotReport);
+  return BindingSecurity::shouldAllowAccessTo(toLocalDOMWindow(accessingContext), targetWindow, BindingSecurity::ErrorReportOption::DoNotReport);
   {% elif interface_name == 'Location' %}
   {{cpp_class}}* impl = {{v8_class}}::toImpl(accessedObject);
-  return BindingSecurity::shouldAllowAccessTo(toLocalDOMWindow(toDOMWindow(accessingContext)), impl, BindingSecurity::ErrorReportOption::DoNotReport);
+  return BindingSecurity::shouldAllowAccessTo(toLocalDOMWindow(accessingContext), impl, BindingSecurity::ErrorReportOption::DoNotReport);
   {% else %}
   #error "Unexpected security check for interface {{interface_name}}"
   {% endif %}
 }
 
 {% if has_cross_origin_named_getter %}
 void {{v8_class_or_partial}}::crossOriginNamedGetter(v8::Local<v8::Name> name, const v8::PropertyCallbackInfo<v8::Value>& info) {
   if (!name->IsString())
     return;
   const AtomicString& propertyName = toCoreAtomicString(name.As<v8::String>());
@@ skipping 477 matching lines @@
 {% endif %}
 }
 {% endif %}
 
 {% endblock %}
 {##############################################################################}
 {% block partial_interface %}{% endblock %}
 }  // namespace blink
 
 {% endfilter %}{# format_blink_cpp_source_code #}