Bring back the retry limit to 3.

base/test/launcher/test_launcher.cc

Index: base/test/launcher/test_launcher.cc
diff --git a/base/test/launcher/test_launcher.cc b/base/test/launcher/test_launcher.cc
index 5d9a95f6fda517bc73ae4c9031df3666af5c57b7..56ed4a27024bd95cfcd87a237a46fe54c9d9be0b 100644
--- a/base/test/launcher/test_launcher.cc
+++ b/base/test/launcher/test_launcher.cc
@@ -343,9 +343,7 @@ TestLauncher::TestLauncher(TestLauncherDelegate* launcher_delegate,
 
     // Enable test retries by default for bots. This can be still overridden
     // from command line using --test-launcher-retry-limit flag.
-    // TODO(sergeyberezin): decrease retry_limit_ back to 3 when the
-    // ignorer_bot is deployed to automatically disable flaky tests.
-    retry_limit_ = 12;
+    retry_limit_ = 3;
   } else {
     // Default to serial test execution if not running on a bot. This makes it
     // possible to disable stdio redirection and can still be overridden with