Skip tests for upcoming DevTools roll

Required for https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2475720

R=sigurds@chromium.org

Bug: 1011811
Change-Id: I8e17d4863f17398f153d39d4b72e4e7d434098eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2484692
Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818424}

third_party/blink/web_tests/TestExpectations

@@ -6463,3 +6463,7 @@ crbug.com/1138591 [ Mac10.15 ] http/tests/dom/raf-throttling-out-of-view-cross-o
 
 # WebRTC: Payload demuxing times out in Plan B. This is expected.
 crbug.com/1139052 virtual/webrtc-wpt-plan-b/external/wpt/webrtc/protocol/unbundled-pt-demuxing.https.html [ Timeout ]
+
+# DevTools roll
+crbug.com/1011811 http/tests/devtools/indexeddb/database-structure.js [ Skip ]
+crbug.com/1011811 http/tests/devtools/indexeddb/database-version-number.js [ Skip ]