[chromedriver] Remove redundant revision negative filter for M55.

chrome/test/chromedriver/test/test_expectations

Index: chrome/test/chromedriver/test/test_expectations
diff --git a/chrome/test/chromedriver/test/test_expectations b/chrome/test/chromedriver/test/test_expectations
index 29f828cdd16f22a42ee738c3b7353a287e2fa34c..acc7a1be4a26e4ad40245bb100517458bec33856 100644
--- a/chrome/test/chromedriver/test/test_expectations
+++ b/chrome/test/chromedriver/test/test_expectations
@@ -100,11 +100,6 @@ _REVISION_NEGATIVE_FILTER['HEAD'] = [
     'BasicMouseInterfaceTest.testDraggingElementWithMouseFiresEvents',
     'BasicMouseInterfaceTest.testDraggingElementWithMouseMovesItToAnotherList',
 ]
-_REVISION_NEGATIVE_FILTER['55'] = [
-    # https://bugs.chromium.org/p/chromedriver/issues/detail?id=1503
-    'BasicMouseInterfaceTest.testDraggingElementWithMouseFiresEvents',
-    'BasicMouseInterfaceTest.testDraggingElementWithMouseMovesItToAnotherList',
-]
 
 _OS_NEGATIVE_FILTER = {}
 _OS_NEGATIVE_FILTER['win'] = [