Updated coded example to reflect current code style conventions (#1018)

Author: realtebo

packages/location/README.md

@@ -98,29 +98,29 @@ import 'package:location/location.dart';
 In order to request location, you should always check Location Service status and Permission status manually
 
 ```dart
-Location location = new Location();
+Location location = Location();
 
-bool _serviceEnabled;
-PermissionStatus _permissionGranted;
-LocationData _locationData;
+bool serviceEnabled;
+PermissionStatus permissionGranted;
+LocationData locationData;
 
-_serviceEnabled = await location.serviceEnabled();
-if (!_serviceEnabled) {
-  _serviceEnabled = await location.requestService();
-  if (!_serviceEnabled) {
+serviceEnabled = await location.serviceEnabled();
+if (!serviceEnabled) {
+  serviceEnabled = await location.requestService();
+  if (!serviceEnabled) {
     return;
   }
 }
 
-_permissionGranted = await location.hasPermission();
-if (_permissionGranted == PermissionStatus.denied) {
-  _permissionGranted = await location.requestPermission();
-  if (_permissionGranted != PermissionStatus.granted) {
+permissionGranted = await location.hasPermission();
+if (permissionGranted == PermissionStatus.denied) {
+  permissionGranted = await location.requestPermission();
+  if (permissionGranted != PermissionStatus.granted) {
     return;
   }
 }
 
-_locationData = await location.getLocation();
+locationData = await location.getLocation();
 ```
 
 You can also get continuous callbacks when your position is changing: