bluetooth: Make device/bluetooth a shared library component.

device/bluetooth/bluetooth_adapter.h

Index: device/bluetooth/bluetooth_adapter.h
diff --git a/device/bluetooth/bluetooth_adapter.h b/device/bluetooth/bluetooth_adapter.h
index f3067689e922417959b2571a8d29a7f1776ad23b..c5551493bc3f4dc397fba8b1e0b2b8e0dc3c12b1 100644
--- a/device/bluetooth/bluetooth_adapter.h
+++ b/device/bluetooth/bluetooth_adapter.h
@@ -15,6 +15,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "device/bluetooth/bluetooth_device.h"
+#include "device/bluetooth/bluetooth_export.h"
 
 namespace device {
 
@@ -31,7 +32,8 @@ class BluetoothUUID;
 // this class also provides support for obtaining the list of remote devices
 // known to the adapter, discovering new devices, and providing notification of
 // updates to device information.
-class BluetoothAdapter : public base::RefCounted<BluetoothAdapter> {
+class DEVICE_BLUETOOTH_EXPORT BluetoothAdapter
+    : public base::RefCounted<BluetoothAdapter> {
  public:
   // Interface for observing changes from bluetooth adapters.
   class Observer {