[Sheriff] Disable TranslateManagerWithMainFrameLanguageDetectionBrowserTest.TranslateIframe

Flake portal:
https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyawsSBUZsYWtlImBjaHJvbWl1bUBicm93c2VyX3Rlc3RzQFRyYW5zbGF0ZU1hbmFnZXJXaXRoTWFpbkZyYW1lTGFuZ3VhZ2VEZXRlY3Rpb25Ccm93c2VyVGVzdC5UcmFuc2xhdGVJZnJhbWUM

TBR=dougarnett@chromium.org

Bug: 1106446
Change-Id: I6008f48820b05353fcef9fe23fa8d9b68d1b44a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303051Reviewed-by: Sahel Sharify <sahel@chromium.org>
Commit-Queue: Sahel Sharify <sahel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789211}

chrome/browser/translate/translate_manager_browsertest.cc

@@ -1955,8 +1955,9 @@ IN_PROC_BROWSER_TEST_F(TranslateManagerWithSubFrameSupportBrowserTest,
 }
 
 // Test that iframes can be translated.
+// TODO(https://crbug.com/1106446) disabled due to flakiness
 IN_PROC_BROWSER_TEST_F(TranslateManagerWithSubFrameSupportBrowserTest,
-                       TranslateIframe) {
+                       DISABLED_TranslateIframe) {
   base::HistogramTester histograms;
   SetTranslateScript(kTestValidScript);