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)

[qyearsley, 2016/03/07 19:09:53]

What are the possible result strings that are returned here? What would it mean
for the result strings to be encoded?

[bokan, 2016/03/07 22:59:15]

The result codes come from the bot so I'm not sure these are exhaustive and if
they vary by bot, this came off the Nexus 4 bot:

u'A': u'AUDIO',
 u'C': u'CRASH',
 u'F': u'TEXT',
 u'I': u'IMAGE',
 u'K': u'LEAK',
 u'L': u'FLAKY',
 u'N': u'NO DATA',
 u'O': u'MISSING',
 u'P': u'PASS',
 u'Q': u'FAIL',
 u'S': u'SLOW',
 u'T': u'TIMEOUT',
 u'U': u'UNKNOWN',
 u'V': u'VERYFLAKY',
 u'X': u'SKIP',
 u'Y': u'NOTRUN',
 u'Z': u'IMAGE+TEXT'}

The encoded version is the one letter version which is what's stored in the
JSON. the expectation_for_type method converts to the human readable string.

+
+            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():