[Telemetry] Reduce a websocket connection between telemetry & devtool browser target

telemetry/telemetry/internal/backends/chrome/system_info_backend.py

Index: telemetry/telemetry/internal/backends/chrome/system_info_backend.py
diff --git a/telemetry/telemetry/internal/backends/chrome/system_info_backend.py b/telemetry/telemetry/internal/backends/chrome/system_info_backend.py
deleted file mode 100644
index 4f716338db02cff74e7aa3f11222277a45914b6b..0000000000000000000000000000000000000000
--- a/telemetry/telemetry/internal/backends/chrome/system_info_backend.py
+++ /dev/null
@@ -1,31 +0,0 @@
-# Copyright 2013 The Chromium Authors. All rights reserved.
-# 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, devtools_port, devtools_page=None):
-    self._port = devtools_port
-    self._page = devtools_page
-
-  def GetSystemInfo(self, timeout=10):
-    req = {'method': 'SystemInfo.getInfo'}
-    websocket = inspector_websocket.InspectorWebsocket()
-    try:
-      if self._page:
-        websocket.Connect('ws://127.0.0.1:%i/devtools/page/%i' %
-                          (self._port, self._page), timeout)
-      else:
-        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']))