Simplification: Remove support for specifying suffix lists when rebaselining.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_cl_unittest.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import json
 import optparse
 
 from webkitpy.common.net.buildbot import Build
 from webkitpy.common.net.git_cl import GitCL
 from webkitpy.common.checkout.git_mock import MockGit
@@ skipping 258 matching lines @@
         """Tests the list of commands that are invoked when rebaseline is called."""
         # First write test contents to the mock filesystem so that
         # fast/dom/prototype-taco.html is considered a real test to rebaseline.
         port = self.tool.port_factory.get('test-win-win7')
         self._write(
             port.host.filesystem.join(port.layout_tests_dir(), 'fast/dom/prototype-taco.html'),
             'test contents')
 
         self.command.rebaseline(
             self.command_options(),
-            {'fast/dom/prototype-taco.html': {Build('MOCK Try Win', 5000): ['txt', 'png']}})
+            {'fast/dom/prototype-taco.html': [Build('MOCK Try Win', 5000)]})
 
         self.assertEqual(
             self.tool.executive.calls,
             [
                 [['python', 'echo', 'copy-existing-baselines-internal', '--suffixes', 'txt',
                   '--builder', 'MOCK Try Win', '--test', 'fast/dom/prototype-taco.html']],
                 [['python', 'echo', 'rebaseline-test-internal', '--suffixes', 'txt',
                   '--builder', 'MOCK Try Win', '--test', 'fast/dom/prototype-taco.html', '--build-number', '5000']],
                 [['python', 'echo', 'optimize-baselines', '--suffixes', 'txt', 'fast/dom/prototype-taco.html']]
             ])
@@ skipping 30 matching lines @@
 
     def test_bails_when_there_are_unstaged_baselines(self):
         git = self.tool.git()
         git.unstaged_changes = lambda: {'third_party/WebKit/LayoutTests/my-test-expected.txt': '?'}
         return_code = self.command.execute(self.command_options(), [], self.tool)
         self.assertEqual(return_code, 1)
         self.assertLog([
             'ERROR: Aborting: there are unstaged baselines:\n',
             'ERROR:   /mock-checkout/third_party/WebKit/LayoutTests/my-test-expected.txt\n',
         ])