service worker: Add console.warn output to enable -expected.txt files

third_party/WebKit/LayoutTests/virtual/service-worker-navigation-preload/http/tests/serviceworker/chromium/navigation-preload-origin-trial-methods-expected.txt

Index: third_party/WebKit/LayoutTests/virtual/service-worker-navigation-preload/http/tests/serviceworker/chromium/navigation-preload-origin-trial-methods-expected.txt
diff --git a/third_party/WebKit/LayoutTests/virtual/service-worker-navigation-preload/http/tests/serviceworker/chromium/navigation-preload-origin-trial-methods-expected.txt b/third_party/WebKit/LayoutTests/virtual/service-worker-navigation-preload/http/tests/serviceworker/chromium/navigation-preload-origin-trial-methods-expected.txt
index 99b1b1223b48203fa86c3a27ba3b5e9f5c7978f5..cd80e54440112d60af60f607361a4e685fe2b819 100644
--- a/third_party/WebKit/LayoutTests/virtual/service-worker-navigation-preload/http/tests/serviceworker/chromium/navigation-preload-origin-trial-methods-expected.txt
+++ b/third_party/WebKit/LayoutTests/virtual/service-worker-navigation-preload/http/tests/serviceworker/chromium/navigation-preload-origin-trial-methods-expected.txt
@@ -1,4 +1,5 @@
-CONSOLE MESSAGE: line 65: --normal SW--
+CONSOLE WARNING: line 13: This test relies on console message comparison so there can be different -expected.txt files for virtual test suites.
+CONSOLE MESSAGE: line 68: --normal SW--
 disable() resolved with: undefined
 enable() resolved with: undefined
 getState() resolved with: {"enabled":true,"headerValue":"world"}
@@ -13,7 +14,7 @@ Fetch event handler
 event.preloadResponse resolved with: [object Response]
 Text of preloadResponse: [Service-Worker-Navigation-Preload header set: hello]
 
-CONSOLE MESSAGE: line 76: --Origin-Trial enabled SW--
+CONSOLE MESSAGE: line 79: --Origin-Trial enabled SW--
 disable() resolved with: undefined
 enable() resolved with: undefined
 getState() resolved with: {"enabled":true,"headerValue":"world"}