Refactors DeviceOrientation to make it more extensible

content/browser/device_orientation/accelerometer_mac.h

Index: content/browser/device_orientation/accelerometer_mac.h
diff --git a/content/browser/device_orientation/accelerometer_mac.h b/content/browser/device_orientation/accelerometer_mac.h
index d94ddb2543f09591391271cad225c62067df6e8f..b03e0a69c6f392244a5e5841c57a7d93414515ef 100644
--- a/content/browser/device_orientation/accelerometer_mac.h
+++ b/content/browser/device_orientation/accelerometer_mac.h
@@ -10,23 +10,27 @@
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/device_orientation/data_fetcher.h"
+#include "content/browser/device_orientation/device_data.h"
 
 class SuddenMotionSensor;
 
 namespace device_orientation {
 
+class Orientation;
+
 class AccelerometerMac : public DataFetcher {
  public:
   static DataFetcher* Create();
 
   // Implement DataFetcher.
-  virtual bool GetOrientation(Orientation* orientation) OVERRIDE;
+  virtual DeviceData* GetDeviceData(DeviceData::Type device_data_type) OVERRIDE;
 
   virtual ~AccelerometerMac();
 
  private:
   AccelerometerMac();
   bool Init();
+  Orientation* GetOrientation();
 
   scoped_ptr<SuddenMotionSensor> sudden_motion_sensor_;
 };