Revert of [Telemetry][CodeHealth] Make unittests with fake platforms use fakes.FakePlatform

telemetry/telemetry/internal/browser/tab_unittest.py

Index: telemetry/telemetry/internal/browser/tab_unittest.py
diff --git a/telemetry/telemetry/internal/browser/tab_unittest.py b/telemetry/telemetry/internal/browser/tab_unittest.py
index 2daeea7ab6ab4c3ea0078e3fed0467da203f4336..9170f8b89c3957163a0c72b09e44cdcc470fe8df 100644
--- a/telemetry/telemetry/internal/browser/tab_unittest.py
+++ b/telemetry/telemetry/internal/browser/tab_unittest.py
@@ -3,11 +3,12 @@
 # found in the LICENSE file.
 
 import logging
+import tempfile
 import time
 
 from telemetry.core import exceptions
 from telemetry import decorators
-from telemetry.testing import fakes
+from telemetry.internal.image_processing import video
 from telemetry.testing import tab_test_case
 from telemetry.timeline import model
 from telemetry.timeline import tracing_config
@@ -19,6 +20,34 @@
 
 def _IsDocumentVisible(tab):
   return not tab.EvaluateJavaScript('document.hidden || document.webkitHidden')
+
+
+class FakePlatformBackend(object):
+  def __init__(self):
+    self.platform = FakePlatform()
+
+  def DidStartBrowser(self, _, _2):
+    pass
+
+  def WillCloseBrowser(self, _, _2):
+    pass
+
+
+class FakePlatform(object):
+  def __init__(self):
+    self._is_video_capture_running = False
+
+  #pylint: disable=unused-argument
+  def StartVideoCapture(self, min_bitrate_mbps):
+    self._is_video_capture_running = True
+
+  def StopVideoCapture(self):
+    self._is_video_capture_running = False
+    return video.Video(tempfile.NamedTemporaryFile())
+
+  @property
+  def is_video_capture_running(self):
+    return self._is_video_capture_running
 
 
 class TabTest(tab_test_case.TabTestCase):
@@ -78,7 +107,7 @@
   def testIsVideoCaptureRunning(self):
     original_platform_backend = self._tab.browser._platform_backend
     try:
-      self._tab.browser._platform_backend = fakes.FakePlatformBackend()
+      self._tab.browser._platform_backend = FakePlatformBackend()
       self.assertFalse(self._tab.is_video_capture_running)
       self._tab.StartVideoCapture(min_bitrate_mbps=2)
       self.assertTrue(self._tab.is_video_capture_running)