[Fetch] Omit console error messages for cancellation, timeout, and non-BlinkInternal

LayoutTests/http/tests/fetch/chromium/error-messages-expected.txt

Index: LayoutTests/http/tests/fetch/chromium/error-messages-expected.txt
diff --git a/LayoutTests/http/tests/fetch/chromium/error-messages-expected.txt b/LayoutTests/http/tests/fetch/chromium/error-messages-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..8393ca04e3033c86405839b3ed262aca695e4c68
--- /dev/null
+++ b/LayoutTests/http/tests/fetch/chromium/error-messages-expected.txt
@@ -0,0 +1,12 @@
+CONSOLE ERROR: Fetch API cannot load http://localhost:8000/fetch/resources/doctype.html. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8000' is therefore not allowed access.
+CONSOLE ERROR: Fetch API cannot load http://localhost:8000/fetch/resources/redirect-loop.php?Count=100&ACAOrigin=*. Redirect failed.
+This is a testharness.js-based test.
+PASS Sequential 
+PASS fetch() with 200 should not output error messages 
+PASS fetch() with 404 should not output error messages 
+PASS net::ERR_TOO_MANY_REDIRECTS should not output error messages 
+PASS net::ERR_INVALID_CHUNKED_ENCODING should not output error messages 
+PASS A didFailAccessControlCheck() error should output an error message 
+PASS A didFailRedirectCheck() error should output an error message 
+Harness: the test ran to completion.
+