Don't run the analyzer_experimental error test on the browser bots.

pkg/pkg.status

Index: pkg/pkg.status
diff --git a/pkg/pkg.status b/pkg/pkg.status
index 5a1ecb1ae16bb01dbb846ec63a154c0aca796aac..27a9d91702876d2c3c87a4c7e4048fc8f49a0e47 100644
--- a/pkg/pkg.status
+++ b/pkg/pkg.status
@@ -67,6 +67,7 @@ analyzer_experimental/test/generated/element_test: Skip # Imports dart:io.
 analyzer_experimental/test/generated/parser_test: Skip # Imports dart:io.
 analyzer_experimental/test/generated/resolver_test: Skip # Imports dart:io.
 analyzer_experimental/test/generated/scanner_test: Skip # Imports dart:io.
+analyzer_experimental/test/error_test: Skip # Imports dart:io.
 
 # Issue 8440 forces us to use pathos in the scheduled_test tests, which would
 # otherwise be dart2js-compatible.
@@ -105,6 +106,7 @@ analyzer_experimental/test/generated/element_test: Skip
 analyzer_experimental/test/generated/parser_test: Skip
 analyzer_experimental/test/generated/resolver_test: Skip
 analyzer_experimental/test/generated/scanner_test: Skip
+analyzer_experimental/test/error_test: Skip # Imports dart:io.
 
 [ $compiler == dartc ]
 unittest/test/mock_regexp_negative_test: Fail