Auto merge of #11179 - asajeffrey:webdriver-resize-window, r=jgraham

Implemented webdriver SetWindowSize.

Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data:
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #10467 (github issue number if applicable).

Either:
- [ ] There are tests for these changes OR
- [X] These changes do not require tests because the new tests are in https://github.com/w3c/web-platform-tests/pull/3024

Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process.

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components/script/script_thread.rs

@@ -1045,8 +1045,6 @@ impl ScriptThread {
                 webdriver_handlers::handle_get_frame_id(&context, pipeline_id, frame_id, reply),
             WebDriverScriptCommand::GetUrl(reply) =>
                 webdriver_handlers::handle_get_url(&context, pipeline_id, reply),
-            WebDriverScriptCommand::GetWindowSize(reply) =>
-                webdriver_handlers::handle_get_window_size(&context, pipeline_id, reply),
             WebDriverScriptCommand::IsEnabled(element_id, reply) =>
                 webdriver_handlers::handle_is_enabled(&context, pipeline_id, element_id, reply),
             WebDriverScriptCommand::IsSelected(element_id, reply) =>