(Telemetry) Rename Device.device_id to Device.guid

tools/telemetry/telemetry/core/platform/__init__.py

Index: tools/telemetry/telemetry/core/platform/__init__.py
diff --git a/tools/telemetry/telemetry/core/platform/__init__.py b/tools/telemetry/telemetry/core/platform/__init__.py
index bca5da304bb798be1aa70bc5ac5036966a80afb1..80bf4932fb8135a83aec4b1b8276526a0b363f9c 100644
--- a/tools/telemetry/telemetry/core/platform/__init__.py
+++ b/tools/telemetry/telemetry/core/platform/__init__.py
@@ -61,20 +61,20 @@ def GetPlatformForDevice(device, logging=real_logging):
     Args:
       device: a device.Device instance.
   """
-  if device.device_id not in _remote_platforms:
+  if device.guid not in _remote_platforms:
     try:
       if isinstance(device, cros_device.CrOSDevice):
         cri = cros_interface.CrOSInterface(
             device.host_name, device.ssh_identity)
         cri.TryLogin()
-        _remote_platforms[device.device_id] = (
+        _remote_platforms[device.guid] = (
             Platform(cros_platform_backend.CrosPlatformBackend(cri)))
       else:
         raise ValueError('Unsupported device type')
     except:
       logging.error('Fail to create platform instance for %s.', device.name)
       raise
-  return _remote_platforms[device.device_id]
+  return _remote_platforms[device.guid]
 
 
 class Platform(object):