[ChromeDriver] Disable failing tests on Mac build bot on Waterfall

Test ChromeDriverTest.testWindowMaximize started to fail on Waterfall on Mac build bot.
Disabling test execution on Mac build bot.

Bug: chromedriver:2522
Change-Id: I96c0de4cfa1ade871dc4605386968145523917ca
Reviewed-on: https://chromium-review.googlesource.com/1153210Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Artur Khachatryan <khachatryan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578687}

chrome/test/chromedriver/test/run_py_tests.py

@@ -111,6 +111,8 @@ _OS_SPECIFIC_FILTER['mac'] = [
     'ChromeDriverTest.testWindowFullScreen',
     # crbug.com/827171
     'ChromeDriverTest.testWindowMinimize',
+    # https://bugs.chromium.org/p/chromedriver/issues/detail?id=2522
+    'ChromeDriverTest.testWindowMaximize',
 ]
 
 _DESKTOP_NEGATIVE_FILTER = [