Deflake tests in http/tests/appcache/ when run in random order

third_party/WebKit/LayoutTests/http/tests/appcache/remove-cache-expected.txt

Index: third_party/WebKit/LayoutTests/http/tests/appcache/remove-cache-expected.txt
diff --git a/third_party/WebKit/LayoutTests/http/tests/appcache/remove-cache-expected.txt b/third_party/WebKit/LayoutTests/http/tests/appcache/remove-cache-expected.txt
index 3f6b8c4eb3d2907438aff0de07454a18cc8c780c..d009b9aa71009d319f98757b83726bbf2cca6854 100644
--- a/third_party/WebKit/LayoutTests/http/tests/appcache/remove-cache-expected.txt
+++ b/third_party/WebKit/LayoutTests/http/tests/appcache/remove-cache-expected.txt
@@ -1,5 +1,4 @@
-CONSOLE WARNING: line 27: Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.
-CONSOLE WARNING: line 27: Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.
+CONSOLE WARNING: line 22: Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.
 Test that a 404 response for manifest results in cache removal.
 
 Frame 1: Manifest is still available, so a new master resource is added to the cache.