Revert of Set use_rndis_forwarder in platform backend.

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

Index: tools/telemetry/telemetry/core/backends/chrome/android_browser_backend.py
diff --git a/tools/telemetry/telemetry/core/backends/chrome/android_browser_backend.py b/tools/telemetry/telemetry/core/backends/chrome/android_browser_backend.py
index d18ee012e28df3e7c590119ba1861c22b75fb840..9170014530c71746b162154eaaf3cb4d9fde2e4a 100644
--- a/tools/telemetry/telemetry/core/backends/chrome/android_browser_backend.py
+++ b/tools/telemetry/telemetry/core/backends/chrome/android_browser_backend.py
@@ -25,8 +25,8 @@
 class AndroidBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
   """The backend for controlling a browser instance running on Android."""
   def __init__(self, android_platform_backend, browser_options,
-               backend_settings, output_profile_path, extensions_to_load,
-               target_arch):
+               backend_settings, use_rndis_forwarder, output_profile_path,
+               extensions_to_load, target_arch):
     assert isinstance(android_platform_backend,
                       android_platform_backend_module.AndroidPlatformBackend)
     super(AndroidBrowserBackend, self).__init__(
@@ -64,9 +64,13 @@
             self._backend_settings.package,
             self._backend_settings.profile_ignore_list)
 
-    if self.browser_options.netsim or self.platform_backend.use_rndis_forwarder:
-      assert self.platform_backend.use_rndis_forwarder, (
-          'Netsim requires RNDIS forwarding.')
+    # Configure platform to use the rndis forwarder.
+    # TODO(ariblue): Move this setting out of a browser-specific path, since
+    # apps may want to use the forwarder, as well.
+    self._platform_backend.SetRndisForwarder(use_rndis_forwarder)
+
+    if self.browser_options.netsim or use_rndis_forwarder:
+      assert use_rndis_forwarder, 'Netsim requires RNDIS forwarding.'
       self.wpr_port_pairs = forwarders.PortPairs(
           http=forwarders.PortPair(0, 80),
           https=forwarders.PortPair(0, 443),