[ChromeDriver] Disable flaky page refresh tests on Waterfall

Tests SlowLoadingPageTest.testRefreshShouldBlockUntilPageLoads and
ChromeDriverPageLoadTimeoutTest.testRefreshWithPageLoadTimeout are
flaky on Linux build bot on Waterfall.
Disabling these tests.

Bug: chromedriver:2532
Change-Id: Id3ff0730b1b4601dcf238771f863a021dd5d4f95
Reviewed-on: https://chromium-review.googlesource.com/1162821Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Artur Khachatryan <khachatryan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580701}

chrome/test/chromedriver/test/run_py_tests.py

@@ -83,7 +83,10 @@ _NEGATIVE_FILTER = [
 ]
 
 _VERSION_SPECIFIC_FILTER = {}
-_VERSION_SPECIFIC_FILTER['HEAD'] = []
+_VERSION_SPECIFIC_FILTER['HEAD'] = [
+    # https://bugs.chromium.org/p/chromedriver/issues/detail?id=2532
+    'ChromeDriverPageLoadTimeoutTest.testRefreshWithPageLoadTimeout',
+]
 
 _VERSION_SPECIFIC_FILTER['69'] = [
     # https://bugs.chromium.org/p/chromedriver/issues/detail?id=2515

chrome/test/chromedriver/test/test_expectations

@@ -177,6 +177,8 @@ _REVISION_NEGATIVE_FILTER['HEAD'] = [
     'TypingTest.testNumericShiftKeys',
     'TypingTest.testAllPrintableKeys',
     'TypingTest.testChordControlCutAndPaste',
+    # https://bugs.chromium.org/p/chromedriver/issues/detail?id=2532
+    'SlowLoadingPageTest.testRefreshShouldBlockUntilPageLoads',
 ]
 
 _OS_NEGATIVE_FILTER = {}