Bluetooth class changes for implementing local GATT attributes.

device/bluetooth/bluetooth_local_gatt_service.h

Index: device/bluetooth/bluetooth_local_gatt_service.h
diff --git a/device/bluetooth/bluetooth_local_gatt_service.h b/device/bluetooth/bluetooth_local_gatt_service.h
index 30c1131e869647de255f9cf2e3d34f3174cedaa1..8ab772ab3470675d288653b96c8598f855f8ecac 100644
--- a/device/bluetooth/bluetooth_local_gatt_service.h
+++ b/device/bluetooth/bluetooth_local_gatt_service.h
@@ -44,7 +44,7 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothLocalGattService
   class Delegate {
    public:
     // Callbacks used for communicating GATT request responses.
-    typedef base::Callback<void(const std::vector<uint8_t>)> ValueCallback;
+    typedef base::Callback<void(const std::vector<uint8_t>&)> ValueCallback;
     typedef base::Closure ErrorCallback;
 
     // Called when a remote device in the central role requests to read the
@@ -85,7 +85,7 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothLocalGattService
         const BluetoothLocalGattCharacteristic* characteristic,
         const std::vector<uint8_t>& value,
         int offset,
-        const ValueCallback& callback,
+        const base::Closure& callback,
         const ErrorCallback& error_callback) = 0;
 
     // Called when a remote device in the central role requests to read the
@@ -126,7 +126,7 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothLocalGattService
         const BluetoothLocalGattDescriptor* descriptor,
         const std::vector<uint8_t>& value,
         int offset,
-        const ValueCallback& callback,
+        const base::Closure& callback,
         const ErrorCallback& error_callback) = 0;
   };