Add explicit constructors with field initializers.

device/bluetooth/bluetooth_task_manager_win.cc

Index: device/bluetooth/bluetooth_task_manager_win.cc
diff --git a/device/bluetooth/bluetooth_task_manager_win.cc b/device/bluetooth/bluetooth_task_manager_win.cc
index 95b580a0402f7e1799e8895f59e7a64bcea317d1..7d8da089d6ef8f33f68d376e42963573631114cd 100644
--- a/device/bluetooth/bluetooth_task_manager_win.cc
+++ b/device/bluetooth/bluetooth_task_manager_win.cc
@@ -123,6 +123,28 @@ namespace device {
 // static
 const int BluetoothTaskManagerWin::kPollIntervalMs = 500;
 
+BluetoothTaskManagerWin::AdapterState::AdapterState() : powered(false) {
+}
+
+BluetoothTaskManagerWin::AdapterState::~AdapterState() {
+}
+
+BluetoothTaskManagerWin::ServiceRecordState::ServiceRecordState() {
+}
+
+BluetoothTaskManagerWin::ServiceRecordState::~ServiceRecordState() {
+}
+
+BluetoothTaskManagerWin::DeviceState::DeviceState()
+    : bluetooth_class(0),
+      visible(false),
+      connected(false),
+      authenticated(false) {
+}
+
+BluetoothTaskManagerWin::DeviceState::~DeviceState() {
+}
+
 BluetoothTaskManagerWin::BluetoothTaskManagerWin(
     scoped_refptr<base::SequencedTaskRunner> ui_task_runner)
     : ui_task_runner_(ui_task_runner),