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It now loads dart:io via mirrors if it's available. This allows it to be compatible with the browser, so a new library "package:http/browser_client.dart" is added to support that. The use of mirrors was tested to ensure that it doesn't add any additional filesize to dart2js compilations over what would be used if "dart:io" support didn't exist. R=rnystrom@google.com Review URL: https://codereview.chromium.org//261763002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@35756 260f80e4-7a28-3924-810f-c04153c831b5