Fix broken chrome_proxy unit tests

tools/chrome_proxy/common/inspector_network_unittest.py

 # Copyright 2014 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.
 
 from common import inspector_network
 from common import network_metrics
 from telemetry import decorators
 from telemetry.testing import tab_test_case
 
 
 class InspectorNetworkTabTest(tab_test_case.TabTestCase):
   class TestCase(object):
     def __init__(self, responses_count=0,
                  subresources=None):
       # Number of responses expected for this case.
       self.responses_count = responses_count
       # List of subresource links for this case.
       self.subresources = subresources
 
   def __init__(self, *args):
     super(InspectorNetworkTabTest, self).__init__(*args)
 
+  def _FilterFaviconEvents(self, events):
+    for event in events:
+      if 'favicon.ico' in event.args['response']['url']:
+        events.remove(event)
+    return events
+
   def _NavigateAndGetHTTPResponseEvents(self, page):
     network = inspector_network.InspectorNetwork(
         self._tab._inspector_backend._websocket)
     network.timeline_recorder.Start()
     self.Navigate(page)
     timeline_model = network.timeline_recorder.Stop()
     self.assertTrue(timeline_model)
     return timeline_model.GetAllEventsOfName('HTTPResponse')
 
-  # crbug.com/449979, crbug.com/452279, crbug.com/455269, crbug.com/483212
-  @decorators.Disabled('mac', 'android', 'win', 'linux', 'chromeos')
   def testHTTPResponseTimelineRecorder(self):
     tests = {
         'blank.html': InspectorNetworkTabTest.TestCase(responses_count=1),
         'green_rect.html': InspectorNetworkTabTest.TestCase(responses_count=1),
         'image_decoding.html': InspectorNetworkTabTest.TestCase(
             responses_count=2, subresources=['image.png']),
         }
     for page, test in tests.iteritems():
-      events = self._NavigateAndGetHTTPResponseEvents(page)
+      events = self._FilterFaviconEvents(
+          self._NavigateAndGetHTTPResponseEvents(page))
       self.assertEqual(test.responses_count, len(events))
 
       # Verify required event fields
       for event in events:
         self.assertEqual('HTTPResponse', event.name)
         resp = inspector_network.InspectorNetworkResponseData.FromTimelineEvent(
             event)
         self.assertLess(0.0, resp.timestamp)
 
         self.assertTrue(resp.headers)
@@ skipping 31 matching lines @@
     events = self._NavigateAndGetHTTPResponseEvents('image_decoding.html')
     images_second = []
     for event in events:
       resp = inspector_network.InspectorNetworkResponseData.FromTimelineEvent(
           event)
       if resp.GetHeader('Content-Type') == 'image/png':
         images_second.append(resp)
     self.assertEqual(1, len(images_second))
     # On the second fetch, the image is served from cache.
     self.assertTrue(images_second[0].served_from_cache)