Upstream service worker prototype test to WPT

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/immutable-prototype-serviceworker.js

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/immutable-prototype-serviceworker.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/immutable-prototype-serviceworker.js b/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/immutable-prototype-serviceworker.js
deleted file mode 100644
index 346b998ceac004b93a3fc505828a2614fbef1560..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/immutable-prototype-serviceworker.js
+++ /dev/null
@@ -1,19 +0,0 @@
-function prototypeChain(global) {
-  let result = [];
-  while (global !== null) {
-    let thrown = false;
-    let next = global.__proto__;
-    try {
-      global.__proto__ = {};
-      result.push('mutable');
-    } catch (e) {
-      result.push('immutable');
-    }
-    global = next;
-  }
-  return result;
-}
-
-self.onmessage = function(e) {
-  e.data.postMessage(prototypeChain(self));
-};