Fix typos in device/bluetooth headers.

device/bluetooth/bluetooth_gatt_characteristic.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_CHARACTERISTIC_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_GATT_CHARACTERISTIC_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "device/bluetooth/bluetooth_gatt_service.h"
 #include "device/bluetooth/bluetooth_uuid.h"
 
 namespace device {
 
 class BluetoothGattDescriptor;
 class BluetoothGattNotifySession;
 
 // BluetoothGattCharacteristic represents a local or remote GATT characteristic.
 // A GATT characteristic is a basic data element used to construct a GATT
 // service. Hence, instances of a BluetoothGattCharacteristic are associated
 // with a BluetoothGattService. There are two ways in which this class is used:
 //
 //   1. To represent GATT characteristics that belong to a service hosted by a
-//      a remote device. In this case the characteristic will be constructed by
+//      remote device. In this case the characteristic will be constructed by
 //      the subsystem.
 //   2. To represent GATT characteristics that belong to a locally hosted
 //      service. To achieve this, users can construct instances of
 //      BluetoothGattCharacteristic directly and add it to the desired
 //      BluetoothGattService instance that represents a local service.
 class BluetoothGattCharacteristic {
  public:
   // TODO(jamuraa): per chromium.org/developers/coding-style these should
   // be MACRO_STYLE instead of kCamelCase. (crbug.com/418696)
 
@@ skipping 166 matching lines @@
   BluetoothGattCharacteristic();
   virtual ~BluetoothGattCharacteristic();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BluetoothGattCharacteristic);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_GATT_CHARACTERISTIC_H_