Bug 1531229 [wpt PR 15556] - [wptrunner] Do not use undefined method,…

… a=testonly

Automatic update from web-platform-tests
[wptrunner] Do not use undefined method

The Selenium wire protocol does not define a "set window rect" method
[1]. Implement the desired behavior by composing the "set window
position" and "set window size" methods.

[1] https://github.com/SeleniumHQ/selenium/wiki/JsonWireProtocol

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wpt-commits: 823542ced8f584e121f6196702e1a7e5958530ed
wpt-pr: 15556

UltraBlame original commit: 0d8c97a32de38d0f89212ff22b484d043748d1b7

testing/web-platform/tests/tools/wptrunner/wptrunner/executors/executorselenium.py

@@ -369,7 +369,8 @@ def do_test(self, test):
             """return [window.outerWidth - window.innerWidth,
                        window.outerHeight - window.innerHeight];"""
         )
-        self.protocol.webdriver.set_window_rect(0, 0, 800 + width_offset, 600 + height_offset)
+        self.protocol.webdriver.set_window_size(0, 0)
+        self.protocol.webdriver.set_window_position(800 + width_offset, 600 + height_offset)
 
         result = self.implementation.run_test(test)