Disable flaky SyncTest#testReenableMasterSyncFirst

Tbr: treib@chromium.org
Bug: 1100890
Change-Id: If5c4219493f82bf7f43aa004244c8d9fc6fdd93c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2275888Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784386}

chrome/android/javatests/src/org/chromium/chrome/browser/sync/SyncTest.java

@@ -170,6 +170,7 @@ public class SyncTest {
     @Test
     @LargeTest
     @Feature({"Sync"})
+    @DisabledTest(message = "Test is flaky crbug.com/1100890")
     public void testReenableMasterSyncFirst() {
         Account account = mSyncTestRule.setUpAccountAndSignInForTesting();
         String authority = AndroidSyncSettings.get().getContractAuthority();