test-results: switch to using new-style master name.

BUG=

Review-Url: https://codereview.chromium.org/2286293003
Cr-Commit-Position: refs/heads/master@{#415152}

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

@@ -109,7 +109,9 @@ class ResultsJSON(object):
 
 
 class BotTestExpectationsFactory(object):
-    RESULTS_URL_PREFIX = 'http://test-results.appspot.com/testfile?master=ChromiumWebkit&testtype=webkit_tests&name=results-small.json&builder='
+    RESULTS_URL_PREFIX = (
+        'http://test-results.appspot.com/testfile?master=chromium.webkit&'
+        'testtype=webkit_tests&name=results-small.json&builder=')
 
     def __init__(self, builders):
         self.builders = builders