Added update_test_expectations script to remove non-flaky test expectations.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/layout_package/bot_test_expectations.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/layout_package/bot_test_expectations.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/layout_package/bot_test_expectations.py b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/layout_package/bot_test_expectations.py
index 91344b2d948b48c5f28f0dfeba5b1ef305f0b2f2..7a4e5dadaeba49624d604f683033e49379f63deb 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/layout_package/bot_test_expectations.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/layout_package/bot_test_expectations.py
@@ -220,6 +220,22 @@ class BotTestExpectations(object):
             unexpected_results_by_path[test_path] = sorted(map(exp_to_string, expectations))
         return unexpected_results_by_path
 
+    def all_results_by_path(self):
+        results_by_path = {}
+        for test_path, entry in self.results_json.walk_results():
+            results_dict = entry.get(self.results_json.RESULTS_KEY, {})
+
+            result_types = self._all_types_in_results(results_dict)
+
+            if not result_types:
+                continue
+
+            # Distinct results as non-encoded strings.
+            result_strings = map(self.results_json.expectation_for_type, result_types)
+
+            results_by_path[test_path] = sorted(result_strings)
+        return results_by_path
+
     def expectation_lines(self, only_ignore_very_flaky):
         lines = []
         for test_path, entry in self.results_json.walk_results():