Added update_test_expectations script to remove non-flaky test expectations.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.py b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.py
index 4fa86268206434ea6c30b456a8d778e4e7e74470..97c3534ec77196afb5e5a1b1eb5865d23c305b12 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/models/test_expectations.py
@@ -433,6 +433,12 @@ class TestExpectationLine(object):
     def is_whitespace_or_comment(self):
         return bool(re.match("^\s*$", self.original_string.split('#')[0]))
 
+    def is_whitespace(self):
+        return self.is_whitespace_or_comment() and self.original_string.strip() == ""
+
+    def is_comment(self):
+        return self.is_whitespace_or_comment() and not self.is_whitespace()
+
     @staticmethod
     def create_passing_expectation(test):
         expectation_line = TestExpectationLine()
@@ -1009,6 +1015,9 @@ class TestExpectations(object):
     def model(self):
         return self._model
 
+    def expectations(self):
+        return self._expectations
+
     def get_needs_rebaseline_failures(self):
         return self._model.get_test_set(NEEDS_REBASELINE)