[sensors](CrOS/Linux) Rename SensorDeviceManager cc and h files.

device/generic_sensor/linux/sensor_device_manager.h

Index: device/generic_sensor/linux/sensor_device_manager.h
diff --git a/device/generic_sensor/linux/platform_sensor_manager.h b/device/generic_sensor/linux/sensor_device_manager.h
similarity index 93%
rename from device/generic_sensor/linux/platform_sensor_manager.h
rename to device/generic_sensor/linux/sensor_device_manager.h
index 5d45e38e823150e509a3e50ee7e17fb887e6b4e5..09528e8a644ba63d3efdf787571b26d520b3a9b7 100644
--- a/device/generic_sensor/linux/platform_sensor_manager.h
+++ b/device/generic_sensor/linux/sensor_device_manager.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef DEVICE_GENERIC_SENSOR_LINUX_PLATFORM_SENSOR_MANAGER_H_
-#define DEVICE_GENERIC_SENSOR_LINUX_PLATFORM_SENSOR_MANAGER_H_
+#ifndef DEVICE_GENERIC_SENSOR_LINUX_SENSOR_DEVICE_MANAGER_H_
+#define DEVICE_GENERIC_SENSOR_LINUX_SENSOR_DEVICE_MANAGER_H_
 
 #include "base/scoped_observer.h"
 
@@ -80,4 +80,4 @@ class DEVICE_GENERIC_SENSOR_EXPORT SensorDeviceManager
 
 }  // namespace device
 
-#endif  // DEVICE_GENERIC_SENSOR_LINUX_PLATFORM_SENSOR_MANAGER_H_
+#endif  // DEVICE_GENERIC_SENSOR_LINUX_SENSOR_DEVICE_MANAGER_H_