Remove the net-internals dependency from chrome proxy telemetry tests.

tools/chrome_proxy/integration_tests/network_metrics.py

Index: tools/chrome_proxy/integration_tests/network_metrics.py
diff --git a/tools/chrome_proxy/integration_tests/network_metrics.py b/tools/chrome_proxy/integration_tests/network_metrics.py
index 59155c9316ff10b81b688787ef24b653a9b411aa..747d60dfb2a7a12f860db5b433682e0cbcbfd94e 100644
--- a/tools/chrome_proxy/integration_tests/network_metrics.py
+++ b/tools/chrome_proxy/integration_tests/network_metrics.py
@@ -26,6 +26,9 @@ class HTTPResponse(object):
   def __init__(self, event):
     self._response = (
         inspector_network.InspectorNetworkResponseData.FromTimelineEvent(event))
+    self._remote_port = None
+    if 'response' in event.args and 'remotePort' in event.args['response']:
+      self._remote_port = event.args['response']['remotePort']
     self._content_length = None
 
   @property
@@ -33,6 +36,10 @@ class HTTPResponse(object):
     return self._response
 
   @property
+  def remote_port(self):
+    return self._remote_port
+
+  @property
   def url_signature(self):
     return hashlib.md5(self.response.url).hexdigest()