[IndexedDB] Disable flaky test

Bug: 772067
Change-Id: Ia18e7aaa8c22a3c401611bc9952d1ab9fa3e01d9
Reviewed-on: https://chromium-review.googlesource.com/703497
Commit-Queue: Kristi Park <kristipark@chromium.org>
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506851}

content/browser/indexed_db/indexed_db_dispatcher_host_unittest.cc

@@ -824,7 +824,8 @@ TEST_F(IndexedDBDispatcherHostTest, AbortTransactionsWhileUpgrading) {
   EXPECT_EQ(::indexed_db::mojom::Status::OK, callback_result);
 }
 
-TEST_F(IndexedDBDispatcherHostTest, NotifyIndexedDBListChanged) {
+// Flaky: crbug.com/772067
+TEST_F(IndexedDBDispatcherHostTest, DISABLED_NotifyIndexedDBListChanged) {
   const int64_t kDBVersion1 = 1;
   const int64_t kDBVersion2 = 2;
   const int64_t kDBVersion3 = 3;