[Telemetry] Move WPR life cycle from browser to platform

tools/telemetry/telemetry/internal/backends/mandoline/android_mandoline_backend.py

Index: tools/telemetry/telemetry/internal/backends/mandoline/android_mandoline_backend.py
diff --git a/tools/telemetry/telemetry/internal/backends/mandoline/android_mandoline_backend.py b/tools/telemetry/telemetry/internal/backends/mandoline/android_mandoline_backend.py
index 4065546a62437faa195f82bdbe1bfe39f7f35b66..a7918cc86f641639b48cdd41cecc97ab482e0b32 100644
--- a/tools/telemetry/telemetry/internal/backends/mandoline/android_mandoline_backend.py
+++ b/tools/telemetry/telemetry/internal/backends/mandoline/android_mandoline_backend.py
@@ -41,9 +41,6 @@ class AndroidMandolineBackend(
     self._device_port = None
     self._chrome_root = chrome_root
 
-    # TODO(wuhu): Move to network controller backend.
-    self.platform_backend.InstallTestCa()
-
     # Kill old browser.
     self._KillBrowser()
 
@@ -62,12 +59,10 @@ class AndroidMandolineBackend(
 
     self.platform_backend.DismissCrashDialogIfNeeded()
 
+    # TODO(crbug.com/404771): Move port forwarding to network_controller.
     self._port = util.GetUnreservedAvailableLocalPort()
     self._device_port = self._GetAvailableDevicePort()
-
-    self.device.adb.Forward('tcp:%d' % self._port, 'tcp:%d' % self._device_port)
-    logging.info('Forwarded host port %d to device port %d.' %
-                     (self._port, self._device_port))
+    self.platform_backend.ForwardHostToDevice(self._port, self._device_port)
 
     args = self.GetBrowserStartupArgs()
 
@@ -144,9 +139,6 @@ class AndroidMandolineBackend(
 
   def Close(self):
     super(AndroidMandolineBackend, self).Close()
-
-    self.platform_backend.RemoveTestCa()
-
     self._KillBrowser()
 
     if self._port: