Revert of "[telemetry] Wire TsProxy through telemetry's network stack."

telemetry/telemetry/testing/browser_test_case.py

Index: telemetry/telemetry/testing/browser_test_case.py
diff --git a/telemetry/telemetry/testing/browser_test_case.py b/telemetry/telemetry/testing/browser_test_case.py
index 9eff8eec1f4716dd7f78fab44a6a19d6b5718f96..956e5d85e8a8b8994fabde0f699e0658f50f3522 100644
--- a/telemetry/telemetry/testing/browser_test_case.py
+++ b/telemetry/telemetry/testing/browser_test_case.py
@@ -85,6 +85,8 @@
       browser_to_create = browser_finder.FindBrowser(options)
       if not browser_to_create:
         raise Exception('No browser found, cannot continue test.')
+      cls._platform = browser_to_create.platform
+      cls._platform.network_controller.InitializeIfNeeded()
 
       try:
         current_browser = browser_to_create.Create(options)
@@ -93,13 +95,13 @@
         cls.tearDownClass()
         raise
     cls._browser = current_browser
-    cls._platform = current_browser.platform
     cls._device = options.remote_platform_options.device
 
   @classmethod
   def tearDownClass(cls):
     if cls._platform:
       cls._platform.StopAllLocalServers()
+      cls._platform.network_controller.Close()
 
   @classmethod
   def CustomizeBrowserOptions(cls, options):