cros: Fix bots by using a different websocket to get system info.

telemetry/telemetry/internal/backends/chrome_inspector/system_info_backend.py

Index: telemetry/telemetry/internal/backends/chrome_inspector/system_info_backend.py
diff --git a/telemetry/telemetry/internal/backends/chrome_inspector/system_info_backend.py b/telemetry/telemetry/internal/backends/chrome_inspector/system_info_backend.py
index 00d390fc7d69cc5a0c33234699776bbbc1503790..516cc0474974dbe61b7552fafd79f33bb3f9fc8e 100644
--- a/telemetry/telemetry/internal/backends/chrome_inspector/system_info_backend.py
+++ b/telemetry/telemetry/internal/backends/chrome_inspector/system_info_backend.py
@@ -2,22 +2,28 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+from telemetry.internal.backends.chrome_inspector import inspector_websocket
 from telemetry.internal.platform import system_info
 from telemetry.internal.util import camel_case
 
 
 class SystemInfoBackend(object):
-  def __init__(self, inspector_socket):
-    self._inspector_socket = inspector_socket
+  def __init__(self, devtools_port):
+    self._port = devtools_port
 
-  def GetSystemInfo(self, timeout):
-    assert self._inspector_socket
+  def GetSystemInfo(self, timeout=10):
     req = {'method': 'SystemInfo.getInfo'}
-    res = self._inspector_socket.SyncRequest(req, timeout)
+    websocket = inspector_websocket.InspectorWebsocket()
+    try:
+      websocket.Connect('ws://127.0.0.1:%i/devtools/browser' % self._port,
+                        timeout)
+      res = websocket.SyncRequest(req, timeout)
+    finally:
+      websocket.Disconnect()
     if 'error' in res:
       return None
     return system_info.SystemInfo.FromDict(
         camel_case.ToUnderscore(res['result']))
 
   def Close(self):
-    self._inspector_socket = None
+    pass