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

device/bluetooth/bluetooth_gatt_connection.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DEVICE_BLUETOOTH_BLUETOOTH_GATT_CONNECTION_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_GATT_CONNECTION_H_
 
 #include <string>
 
 #include "base/callback.h"
+#include "device/bluetooth/bluetooth_export.h"
 
 namespace device {
 
 // BluetoothGattConnection represents a GATT connection to a Bluetooth device
 // that has GATT services. Instances are obtained from a BluetoothDevice,
 // and the connection is kept alive as long as there is at least one
 // active BluetoothGattConnection object. BluetoothGattConnection objects
 // automatically update themselves, when the connection is terminated by the
 // operating system (e.g. due to user action).
-class BluetoothGattConnection {
+class BLUETOOTH_EXPORT BluetoothGattConnection {
  public:
   // Destructor automatically closes this GATT connection. If this is the last
   // remaining GATT connection and this results in a call to the OS, that call
   // may not always succeed. Users can make an explicit call to
   // BluetoothGattConnection::Close to make sure that they are notified of
   // a possible error via the callback.
   virtual ~BluetoothGattConnection();
 
   // Returns the Bluetooth address of the device that this connection is open
   // to.
@@ skipping 10 matching lines @@
  protected:
   BluetoothGattConnection();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BluetoothGattConnection);
 };
 
 }  // namespace device
 
 #endif  //  DEVICE_BLUETOOTH_BLUETOOTH_GATT_CONNECTION_H_