Update AccelerometerReader Error Output

chromeos/accelerometer/accelerometer_reader.cc

Index: chromeos/accelerometer/accelerometer_reader.cc
diff --git a/chromeos/accelerometer/accelerometer_reader.cc b/chromeos/accelerometer/accelerometer_reader.cc
index 38d683dda13985c3bd1e309a1c981410103dec5f..bf96443c22bc1febe1e68ba895c33482e9f66e84 100644
--- a/chromeos/accelerometer/accelerometer_reader.cc
+++ b/chromeos/accelerometer/accelerometer_reader.cc
@@ -235,8 +235,8 @@ void AccelerometerFileReader::Initialize(
   // 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;
   }