bluetooth: Make device/bluetooth a shared library component.

device/bluetooth/bluetooth_gatt_notify_session.h

Index: device/bluetooth/bluetooth_gatt_notify_session.h
diff --git a/device/bluetooth/bluetooth_gatt_notify_session.h b/device/bluetooth/bluetooth_gatt_notify_session.h
index 929656a5786b860e639655c6ca735bb75425d2cf..4c63563b71212de5ebc3f1cd392c1ec6d6f797a3 100644
--- a/device/bluetooth/bluetooth_gatt_notify_session.h
+++ b/device/bluetooth/bluetooth_gatt_notify_session.h
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "base/callback.h"
+#include "device/bluetooth/bluetooth_export.h"
 
 namespace device {
 
@@ -15,7 +16,7 @@ namespace device {
 // to value updates from GATT characteristics that support notifications and/or
 // indications. Instances are obtained by calling
 // BluetoothGattCharacteristic::StartNotifySession.
-class BluetoothGattNotifySession {
+class DEVICE_BLUETOOTH_EXPORT BluetoothGattNotifySession {
  public:
   // Destructor automatically stops this session.
   virtual ~BluetoothGattNotifySession();