Disable 2 flaky tests for e2e sync tests

Bug: 1010568
Change-Id: I34de7b8c34964dc46cd9f5e925ee31f2f7c7f4d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1856730
Auto-Submit: Sven Zheng <svenzheng@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705614}

testing/buildbot/filters/e2e.sync_integration_tests.filter

@@ -24,3 +24,6 @@
 -TwoClientTypedUrlsSyncTest.AddThenDelete_E2ETest
 -TwoClientTypedUrlsSyncTest.DisableEnableSync_E2ETest
 -TwoClientAutofillProfileSyncTest.DISABLED_E2ETest_TwoClientsAddAutofillProfiles
+# Flaky on bots. Can't log in to GCM.
+-TwoClientDictionarySyncTest.Sanity_E2ETest
+-USS/TwoClientBookmarksSyncTestIncludingUssTests.E2ETest_TwoClientsAddBookmarks/0
\ No newline at end of file