mojo js binding: mojo js template interface_definition should generate...

mojo js binding: mojo js template interface_definition should generate !Promise instead of Promise for annotation

Bug: 1100700
Change-Id: I51a5b0babe4557baa070fde216fdbc2264f021a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276665Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785865}

mojo/public/tools/bindings/generators/js_templates/lite/interface_definition.tmpl

@@ -5,9 +5,9 @@
 {%-   endfor -%}
 {%-   if method.response_parameters != None %}
 {%-     if method.response_parameters|length == 0 %}
-   * @return {Promise}
+   * @return {!Promise}
 {%-     else %}
-   * @return {Promise<{
+   * @return {!Promise<{
 {%-       for response_parameter in method.response_parameters %}
         {{response_parameter.name}}: {{response_parameter.kind|lite_closure_type_with_nullability}},
 {%-       endfor %}