Update disabled test message to link to the correct crbug

TBR=harringtond@chromium.org

Bug: 923212
Change-Id: I76d739ab9b8d86881a7c51e13cde4b2659e03f04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134505Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Commit-Queue: Carlos Knippschild <carlosk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756119}

chrome/android/javatests/src/org/chromium/chrome/browser/offlinepages/OfflinePageAutoFetchTest.java

@@ -338,7 +338,7 @@ public class OfflinePageAutoFetchTest {
     @Test
     @MediumTest
     @Feature({"OfflineAutoFetch"})
-    @DisabledTest(message = "Flaky: https://crbug.com/883486#c20")
+    @DisabledTest(message = "https://crbug.com/923212")
     public void testAutoFetchRequestRetainedOnOtherTabClosed() throws Exception {
         startWebServer();
         final String testUrl = mWebServer.getBaseUrl();