Fix typo.

device/bluetooth/bluetooth_device.h

Index: device/bluetooth/bluetooth_device.h
diff --git a/device/bluetooth/bluetooth_device.h b/device/bluetooth/bluetooth_device.h
index 2f3a96b3edae3cbf62346ddb71a6458bcfebcbbb..3c273ffcb775c01c8cb7a66118471e08c03b4778 100644
--- a/device/bluetooth/bluetooth_device.h
+++ b/device/bluetooth/bluetooth_device.h
@@ -398,7 +398,7 @@ class BluetoothDevice {
   virtual BluetoothGattService* GetGattService(
       const std::string& identifier) const;
 
-  // Returns the |address| in the canoncial format: XX:XX:XX:XX:XX:XX, where
+  // Returns the |address| in the canonical format: XX:XX:XX:XX:XX:XX, where
   // each 'X' is a hex digit.  If the input |address| is invalid, returns an
   // empty string.
   static std::string CanonicalizeAddress(const std::string& address);