[telemetry] Cleaning up Forwarders and Ports.

tools/telemetry/telemetry/desktop_browser_backend.py

Index: tools/telemetry/telemetry/desktop_browser_backend.py
diff --git a/tools/telemetry/telemetry/desktop_browser_backend.py b/tools/telemetry/telemetry/desktop_browser_backend.py
index f70a1c8682595dd7ee520a462a2e38f2f9020f52..43ac0b5c1588aa830486a146afd33c6a873e14d1 100644
--- a/tools/telemetry/telemetry/desktop_browser_backend.py
+++ b/tools/telemetry/telemetry/desktop_browser_backend.py
@@ -105,12 +105,12 @@ class DesktopBrowserBackend(browser_backend.BrowserBackend):
       self._tmp_output_file.close()
       self._tmp_output_file = None
 
-  def CreateForwarder(self, *ports):
-    return DoNothingForwarder(ports[0])
+  def CreateForwarder(self, *port_pairs):
+    return DoNothingForwarder(*port_pairs)
 
 class DoNothingForwarder(object):
   def __init__(self, *port_pairs):
-    self._host_port = port_pairs[0][0]
+    self._host_port = port_pairs[0].local_port
 
   @property
   def url(self):