[Telemetry] Move WPR life cycle from browser to platform

tools/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py

Index: tools/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py
diff --git a/tools/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py b/tools/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py
index 6c857b75ec48a8190a9055093da169966e61c3ef..b763d3588d1fba7379cd8fe7cf8f9dbc0207276e 100644
--- a/tools/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py
+++ b/tools/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py
@@ -13,7 +13,6 @@ from telemetry.internal.backends import android_command_line_backend
 from telemetry.internal.backends import browser_backend
 from telemetry.internal.backends.chrome import chrome_browser_backend
 from telemetry.internal.browser import user_agent
-from telemetry.internal import forwarders
 
 from devil.android.sdk import intent
 
@@ -46,9 +45,6 @@ class AndroidBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
     self._target_arch = target_arch
     self._saved_sslflag = ''
 
-    # TODO(wuhu): Move to network controller backend.
-    self.platform_backend.InstallTestCa()
-
     # Kill old browser.
     self._KillBrowser()
 
@@ -62,14 +58,6 @@ class AndroidBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
             self._backend_settings.package,
             self._backend_settings.profile_ignore_list)
 
-    if self.browser_options.netsim:
-      assert self.platform_backend.use_rndis_forwarder, (
-          'Netsim requires RNDIS forwarding.')
-      self.wpr_port_pairs = forwarders.PortPairs(
-          http=forwarders.PortPair(0, 80),
-          https=forwarders.PortPair(0, 443),
-          dns=forwarders.PortPair(0, 53))
-
     # Set the debug app if needed.
     self.platform_backend.SetDebugApp(self._backend_settings.package)
 
@@ -113,42 +101,15 @@ class AndroidBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
                         extras=user_agent_dict),
           blocking=True)
 
+      # TODO(crbug.com/404771): Move port forwarding to network_controller.
       remote_devtools_port = self._backend_settings.GetDevtoolsRemotePort(
           self.device)
-      try:
-        # Release reserved port right before forwarding host to device.
-        self._port_keeper.Release()
-        assert self._port == self._port_keeper.port, (
+      # Release reserved port right before forwarding host to device.
+      self._port_keeper.Release()
+      assert self._port == self._port_keeper.port, (
           'Android browser backend must use reserved port by _port_keeper')
-        self.platform_backend.ForwardHostToDevice(
-            self._port, remote_devtools_port)
-      except Exception:
-        logging.exception('Failed to forward %s to %s.',
-            str(self._port), str(remote_devtools_port))
-        logging.warning('Currently forwarding:')
-        try:
-          for line in self.device.adb.ForwardList().splitlines():
-            logging.warning('  %s', line)
-        except Exception:
-          logging.warning('Exception raised while listing forwarded '
-                          'connections.')
-
-        logging.warning('Host tcp ports in use:')
-        try:
-          for line in subprocess.check_output(['netstat', '-t']).splitlines():
-            logging.warning('  %s', line)
-        except Exception:
-          logging.warning('Exception raised while listing tcp ports.')
-
-        logging.warning('Device unix domain sockets in use:')
-        try:
-          for line in self.device.ReadFile('/proc/net/unix', as_root=True,
-                                           force_pull=True).splitlines():
-            logging.warning('  %s', line)
-        except Exception:
-          logging.warning('Exception raised while listing unix domain sockets.')
-
-        raise
+      self.platform_backend.ForwardHostToDevice(
+          self._port, remote_devtools_port)
 
       try:
         self._WaitForBrowserToComeUp()
@@ -207,8 +168,6 @@ class AndroidBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
   def Close(self):
     super(AndroidBrowserBackend, self).Close()
 
-    self.platform_backend.RemoveTestCa()
-
     self._KillBrowser()
 
     self.platform_backend.StopForwardingHost(self._port)