Reland of Switch to use SequencedTaskChecker instead of ThreadChecker where needed.

(patchset #1 id:1 of https://codereview.webrtc.org/2149553002/ )"
This reverts commit efd902cb1d9bbd81247a3e168f2080beae761d78.

Originally reviewed in https://codereview.webrtc.org/2149553002

The uptream problem should be fixed by https://codereview.webrtc.org/2145393003/

BUG=webrtc:5687
TBR=tommi@webrtc.org

Review-Url: https://codereview.webrtc.org/2152013002
Cr-Commit-Position: refs/heads/master@{#13483}
diff --git a/webrtc/modules/video_coding/BUILD.gn b/webrtc/modules/video_coding/BUILD.gn
index 30d0f11..d7143fd 100644
--- a/webrtc/modules/video_coding/BUILD.gn
+++ b/webrtc/modules/video_coding/BUILD.gn
@@ -125,6 +125,7 @@
   }
 
   deps = [
+    "../../common_video",
     "../../system_wrappers",
   ]
 }