[memories] Add components/history_clusters/internal to gitignore

Change-Id: I35a2338a44783f37d7837c618a8b91011f5ed0c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2976446
Auto-Submit: Sophie Chang <sophiechang@chromium.org>
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#895804}

.gitignore

@@ -186,6 +186,7 @@ vs-chromium-project.txt
 /components/chrome_settings_proto_generated_compile.xml
 /components/cloud_policy_proto_generated_compile.xml
 /components/gcm_driver.xml
+/components/history_clusters/internal
 /components/leveldb_proto_test_support.xml
 /components/ntp_tiles/resources/internal
 /components/resources/default_100_percent/google_chrome