Change AccelerometerReader to a Singleton

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 9a91383a88d61b04705967e0b17f02c36c44ecc1..e2a5e7915fb2f2a7b0c9014903d1aa969fa32f11 100644
--- a/chromeos/accelerometer/accelerometer_reader.cc
+++ b/chromeos/accelerometer/accelerometer_reader.cc
@@ -9,6 +9,7 @@
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
+#include "base/memory/singleton.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ -187,12 +188,9 @@ AccelerometerReader::ConfigurationData::ConfigurationData()
 AccelerometerReader::ConfigurationData::~ConfigurationData() {
 }
 
-AccelerometerReader::AccelerometerReader()
-    : configuration_(new AccelerometerReader::Configuration()),
-      weak_factory_(this) {
-}
-
-AccelerometerReader::~AccelerometerReader() {
+// static
+AccelerometerReader* AccelerometerReader::GetInstance() {
+  return Singleton<AccelerometerReader>::get();
 }
 
 void AccelerometerReader::Initialize(
@@ -224,6 +222,14 @@ bool AccelerometerReader::IsReadingStable(const ui::AccelerometerUpdate& update,
              kDeviationFromGravityThreshold;
 }
 
+AccelerometerReader::AccelerometerReader()
+    : configuration_(new AccelerometerReader::Configuration()),
+      weak_factory_(this) {
+}
+
+AccelerometerReader::~AccelerometerReader() {
+}
+
 void AccelerometerReader::OnInitialized(
     scoped_refptr<AccelerometerReader::Configuration> configuration,
     bool success) {