[Clean up] Introduce a BLUETOOTH_EXPORT macro to control symbol visibility outside of //device/blue…

device/bluetooth/bluetooth_gatt_characteristic.h

Index: device/bluetooth/bluetooth_gatt_characteristic.h
diff --git a/device/bluetooth/bluetooth_gatt_characteristic.h b/device/bluetooth/bluetooth_gatt_characteristic.h
index 522c3d018a713f1a4930631a04d787718883646f..42909b58162afd9b13a0cc4550be436e95f60d97 100644
--- a/device/bluetooth/bluetooth_gatt_characteristic.h
+++ b/device/bluetooth/bluetooth_gatt_characteristic.h
@@ -11,6 +11,7 @@
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
+#include "device/bluetooth/bluetooth_export.h"
 #include "device/bluetooth/bluetooth_gatt_service.h"
 #include "device/bluetooth/bluetooth_uuid.h"
 
@@ -31,7 +32,7 @@ class BluetoothGattNotifySession;
 //      service. To achieve this, users can construct instances of
 //      BluetoothGattCharacteristic directly and add it to the desired
 //      BluetoothGattService instance that represents a local service.
-class BluetoothGattCharacteristic {
+class BLUETOOTH_EXPORT BluetoothGattCharacteristic {
  public:
   // TODO(jamuraa): per chromium.org/developers/coding-style these should
   // be MACRO_STYLE instead of kCamelCase. (crbug.com/418696)