Normalize and update the header value checks to RFC 7230 for Fetch

LayoutTests/http/tests/fetch/script-tests/headers.js

Index: LayoutTests/http/tests/fetch/script-tests/headers.js
diff --git a/LayoutTests/http/tests/fetch/script-tests/headers.js b/LayoutTests/http/tests/fetch/script-tests/headers.js
index 4dd6037237a186f84604b764124bd4815f2e63bb..58a8b699b735c55a66b34477f4f4a75d0a9f2134 100644
--- a/LayoutTests/http/tests/fetch/script-tests/headers.js
+++ b/LayoutTests/http/tests/fetch/script-tests/headers.js
@@ -176,6 +176,37 @@ test(function() {
     assert_equals(headers.get('a'), 'b');
     assert_equals(headers.get('c'), 'd');
 
+    // Tests for new valid Headers values.
+    headers = new Headers();
+    headers.set('a', '\xd0\xa1');
+    assert_equals(headers.get('a'), '\xd0\xa1');
+    headers.append('b', 't t');
+    assert_equals(headers.get('b'), 't t');
+    headers.append('c', 't\tt');
+    assert_equals(headers.get('c'), 't\tt');
+    headers.set('k', '');
+    assert_equals(headers.get('k'), '');
+    headers.append('l', ' ');
+    assert_equals(headers.get('l'), '');
+    headers.append('m', '\r\n\r\n\r\n');
+    assert_equals(headers.get('m'), '');
+
+    // Tests for normalizing header values.
+    headers.append('d', ' t');
+    assert_equals(headers.get('d'), 't');
+    headers.set('e', 't ');
+    assert_equals(headers.get('d'), 't');
+    headers.append('f', ' t ');
+    assert_equals(headers.get('f'), 't');
+    headers.append('g', 'test\r');
+    assert_equals(headers.get('g'), 'test');
+    headers.set('h', 'test\n');
+    assert_equals(headers.get('h'), 'test');
+    headers.append('i', 'test\r\n');
+    assert_equals(headers.get('i'), 'test');
+    headers.append('j', 'test\t');
+    assert_equals(headers.get('j'), 'test');
+
     // Throw errors
     INVALID_HEADER_NAMES.forEach(function(name) {
         assert_throws({name: 'TypeError'},