Fix summary tests on Windows.

pkg/pkg.status

Index: pkg/pkg.status
diff --git a/pkg/pkg.status b/pkg/pkg.status
index 0d0867a8961de6f1775cce95c74f77a8b7e38435..9e10464ced43b8094c348db0afcce2046687ffcc 100644
--- a/pkg/pkg.status
+++ b/pkg/pkg.status
@@ -30,10 +30,6 @@ analysis_server/test/analysis/get_errors_test: Skip # runtime error, Issue 22180
 analysis_server/test/integration/analysis/analysis_options_test: RuntimeError # Issue 24796
 analyzer/test/generated/all_the_rest_test: Fail # Issue 21772
 analyzer/test/generated/source_factory_test: RuntimeError # Issue 26828
-analyzer/test/src/summary/linker_test: RuntimeError # Issue 26828
-analyzer/test/src/summary/prelinker_test: RuntimeError # Issue 26828
-analyzer/test/src/summary/summarize_elements_strong_test: RuntimeError # Issue 26828
-analyzer/test/src/summary/summarize_elements_test: RuntimeError # Issue 26828
 
 [ $compiler == dart2js ]
 analysis_server/test/integration: SkipByDesign # Analysis server integration tests don't make sense to run under dart2js, since the code under test always runs in the Dart vm as a subprocess.