Fix disable comment to point to only one tracker for both device and simulator failure.

Bug: 847948,852341
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I77f63093d642a51193787641568a639f80d5c5e1
Reviewed-on: https://chromium-review.googlesource.com/1148796
Commit-Queue: Lindsay Pasricha <lindsayw@chromium.org>
Reviewed-by: Mohammad Refaat <mrefaat@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577925}

ios/chrome/browser/metrics/external_url_tab_usage_recorder_egtest.mm

@@ -29,8 +29,7 @@ const char kTestUrl[] =
 
 @implementation ExternalURLTabUsageRecorderTestCase
 
-// TODO(crbug.com/847948): This test is faling on devices.
-// TODO(crbug.com/852341): This test is faling on simulators.
+// TODO(crbug.com/852341): This test is failing on devices and simulators.
 // Verify correct recording of metrics when the reloading of an evicted tab
 // fails.
 - (void)DISABLED_testEvictedTabReloadFailure {