[ChromeDriver] Disable some tests on Mac for Chrome v69

Disabling window maximize tests on Mac for Chrome v69

Change-Id: Ide707ac877e3f94b32d48ad27400aba41782a19f
Reviewed-on: https://chromium-review.googlesource.com/c/1314137Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604916}

chrome/test/chromedriver/test/test_expectations

@@ -37,6 +37,12 @@ _OS_NEGATIVE_FILTER['mac'] = [
 ]
 
 _SPECIFIC_OS_REVISION_NEGATIVE_FILTER = {}
+_SPECIFIC_OS_REVISION_NEGATIVE_FILTER['mac_69'] = [
+    # Maximize window doesn't always increase window size on Mac 69
+    'WindowTest.testCanMaximizeTheWindowFromFrame',
+    'WindowTest.testCanMaximizeTheWindowFromIframe',
+    'WindowTest.testCanMaximizeTheWindow',
+]
 
 _OS_NEGATIVE_FILTER['android:chrome'] = [
     'ChromeOptionsFunctionalTest.*',