indexeddb: reenable IndexedDBBrowserTest.NegativeDBSchemaVersion

This was accidentally disabled in:
https://chromium-review.googlesource.com/c/chromium/src/+/2090878

Bug: 1015214,346399
Change-Id: I49a660ceff9333b48be450335a339a34f83bc505
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2105956Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Auto-Submit: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750648}

content/browser/indexed_db/indexed_db_browsertest.cc

@@ -372,7 +372,6 @@ IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTest, Bug941965Test) {
 }
 
 IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTest, NegativeDBSchemaVersion) {
-  return;
   const GURL database_open_url = GetTestUrl("indexeddb", "database_test.html");
   const url::Origin origin = url::Origin::Create(database_open_url);
   // Create the database.