Skip wpt/workers/semantics/encodings until crbug.com/656171 is resolved.

BUG=656171

Review-Url: https://chromiumcodereview.appspot.com/2429523003
Cr-Commit-Position: refs/heads/master@{#426118}
diff --git a/third_party/WebKit/LayoutTests/W3CImportExpectations b/third_party/WebKit/LayoutTests/W3CImportExpectations
index cc61764b..4014284 100644
--- a/third_party/WebKit/LayoutTests/W3CImportExpectations
+++ b/third_party/WebKit/LayoutTests/W3CImportExpectations
@@ -768,3 +768,6 @@
 imported/wpt/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-1.html [ Skip ]
 imported/wpt/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-2.html [ Skip ]
 imported/wpt/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_popups_nonescaping-3.html [ Skip ]
+
+# crbug.com/656171: w3c-test-importer fails to import file with non-valid utf8 (004.worker.js).
+crbug.com/656171 imported/wpt/workers/semantics/encodings [ Skip ]