Fix orphaned wpt -expected.txt file deletion logic.

third_party/WebKit/LayoutTests/external/wpt/html/webappapis/scripting/events/messageevent-constructor-expected.txt

Index: third_party/WebKit/LayoutTests/external/wpt/html/webappapis/scripting/events/messageevent-constructor-expected.txt
diff --git a/third_party/WebKit/LayoutTests/external/wpt/html/webappapis/scripting/events/messageevent-constructor-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/html/webappapis/scripting/events/messageevent-constructor-expected.txt
deleted file mode 100644
index 062d65478531e700bd45f9567811311edc7d5cc9..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/external/wpt/html/webappapis/scripting/events/messageevent-constructor-expected.txt
+++ /dev/null
@@ -1,14 +0,0 @@
-This is a testharness.js-based test.
-FAIL Default event values Cannot read property 'length' of null
-PASS MessageEventInit dictionary 
-FAIL Passing null for ports member assert_throws: function "function () {
-    new MessageEvent("test", { ports: null })
-  }" did not throw
-FAIL ports attribute should be a FrozenArray assert_true: Object.isFrozen() should return true expected true got false
-PASS initMessageEvent operation 
-FAIL Passing null for ports parameter to initMessageEvent assert_throws: function "function () {
-    ev.initMessageEvent("test", true, false, "testData", "testOrigin", "testId", window, null)
-  }" did not throw
-FAIL All parameters to initMessageEvent should be mandatory assert_equals: MessageEvent.prototype.initMessageEvent.length should be 8 expected 8 but got 0
-Harness: the test ran to completion.
-