Update AccelerometerReader Error Output

chromeos/accelerometer/accelerometer_reader.cc

 // 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.
 
 #include "chromeos/accelerometer/accelerometer_reader.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
@@ skipping 217 matching lines @@
 void AccelerometerFileReader::Initialize(
     scoped_refptr<base::SequencedTaskRunner> sequenced_task_runner) {
   DCHECK(
       base::SequencedWorkerPool::GetSequenceTokenForCurrentThread().IsValid());
   task_runner_ = sequenced_task_runner;
 
   // Check for accelerometer symlink which will be created by the udev rules
   // file on detecting the device.
   if (base::IsDirectoryEmpty(base::FilePath(kAccelerometerDevicePath))) {
     if (base::SysInfo::IsRunningOnChromeOS()) {
-      LOG(ERROR) << "Accelerometer device directory is empty at "
-                 << kAccelerometerDevicePath;
+      LOG(WARNING) << "Accelerometer device directory is empty at "
+                   << kAccelerometerDevicePath;
     }
     return;
   }
   if (!base::PathExists(base::FilePath(kAccelerometerTriggerPath))) {
     if (base::SysInfo::IsRunningOnChromeOS()) {
       LOG(ERROR) << "Accelerometer trigger does not exist at"
                  << kAccelerometerTriggerPath;
     }
     return;
   }
@@ skipping 251 matching lines @@
 }
 
 AccelerometerReader::AccelerometerReader()
     : accelerometer_file_reader_(new AccelerometerFileReader()) {
 }
 
 AccelerometerReader::~AccelerometerReader() {
 }
 
 }  // namespace chromeos