Fix OAuth2 tests, and disable them on non-dart:io platforms.

pkg/pkg.status

Index: pkg/pkg.status
diff --git a/pkg/pkg.status b/pkg/pkg.status
index a8b011d3443a8b4e9a4f9b8b109b5939386a89bb..89417ddacdfe06c6bc2f2b1b6578f6e3b0de35d9 100644
--- a/pkg/pkg.status
+++ b/pkg/pkg.status
@@ -15,10 +15,12 @@ fixnum/test/int_64_vm_test: Skip
 # Don't compiile tests that use dart:io to JS
 [ $compiler == dart2js || $compiler == dart2dart || $compiler == dartc ]
 http/test/*: Skip
+oauth2/test/*: Skip
 
 # Skip tests that use local file access if we're running in any browser
 [ $runtime == opera || $runtime == ff || $runtime == ie9 || $runtime == dartium || $runtime == chrome || $runtime == safari || $runtime == drt ]
 http/test/*: Skip
+oauth2/test/*: Skip
 intl/test/date_time_format_file_even_test: Skip
 intl/test/date_time_format_file_odd_test: Skip
 intl/test/find_default_locale_standalone_test: Skip