Import //fetch from Web Platform Tests.

third_party/WebKit/LayoutTests/external/wpt/fetch/api/headers/headers-basic-expected.txt

Index: third_party/WebKit/LayoutTests/external/wpt/fetch/api/headers/headers-basic-expected.txt
diff --git a/third_party/WebKit/LayoutTests/external/wpt/fetch/api/headers/headers-basic-expected.txt b/third_party/WebKit/LayoutTests/external/wpt/fetch/api/headers/headers-basic-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ae0d7a5a28174e1b9490198bcbb8f5389a2f5a4e
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/fetch/api/headers/headers-basic-expected.txt
@@ -0,0 +1,22 @@
+This is a testharness.js-based test.
+PASS Create headers from no parameter 
+FAIL Create headers from undefined parameter Failed to construct 'Headers': No matching constructor signature.
+PASS Create headers from empty object 
+PASS Create headers with null should throw 
+PASS Create headers with 1 should throw 
+PASS Create headers with sequence 
+PASS Create headers with record 
+PASS Create headers with existing headers 
+FAIL Create headers with existing headers with custom iterator assert_equals: expected (string) "test" but got (object) null
+PASS Check append method 
+PASS Check set method 
+PASS Check has method 
+PASS Check delete method 
+PASS Check get method 
+FAIL Check keys method assert_equals: expected object "[object Object]" but got object "[object Object]"
+FAIL Check values method assert_equals: expected object "[object Object]" but got object "[object Object]"
+FAIL Check entries method assert_equals: expected object "[object Object]" but got object "[object Object]"
+PASS Check Symbol.iterator method 
+PASS Check forEach method 
+Harness: the test ran to completion.
+