Remove the HttpRequest.queryParameters getter

The parsed query parameters are now now available from the Uri object.

TBR=whesse@google.com

BUG=http://dartbug/2641

Review URL: https://codereview.chromium.org//15688013

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@23413 260f80e4-7a28-3924-810f-c04153c831b5
diff --git a/lib/oauth2.dart b/lib/oauth2.dart
index 96bffcf..cca66ab 100644
--- a/lib/oauth2.dart
+++ b/lib/oauth2.dart
@@ -96,7 +96,7 @@
 ///         // Once the user is redirected to `redirectUrl`, pass the query
 ///         // parameters to the AuthorizationCodeGrant. It will validate them
 ///         // and extract the authorization code to create a new Client.
-///         return grant.handleAuthorizationResponse(request.queryParameters);
+///         return grant.handleAuthorizationResponse(request.uri.queryParameters);
 ///       })
 ///     }).then((client) {
 ///       // Once you have a Client, you can use it just like any other HTTP