Make telemetry platform a singleton

tools/telemetry/telemetry/core/platform/factory.py

Index: tools/telemetry/telemetry/core/platform/factory.py
diff --git a/tools/telemetry/telemetry/core/platform/factory.py b/tools/telemetry/telemetry/core/platform/factory.py
deleted file mode 100644
index 75ac32dc1060e8054f4a285ecb901b3d1428082c..0000000000000000000000000000000000000000
--- a/tools/telemetry/telemetry/core/platform/factory.py
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright 2014 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.
-
-import sys
-
-from telemetry import decorators
-from telemetry.core.platform import linux_platform_backend
-from telemetry.core.platform import mac_platform_backend
-from telemetry.core.platform import win_platform_backend
-
-
-@decorators.Cache
-def GetPlatformBackendForCurrentOS():
-  if sys.platform.startswith('linux'):
-    return linux_platform_backend.LinuxPlatformBackend()
-  elif sys.platform == 'darwin':
-    return mac_platform_backend.MacPlatformBackend()
-  elif sys.platform == 'win32':
-    return win_platform_backend.WinPlatformBackend()
-  else:
-    raise NotImplementedError()