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/video_coding.gypi b/webrtc/modules/video_coding/video_coding.gypi
index 602f368..0b682c7 100644
--- a/webrtc/modules/video_coding/video_coding.gypi
+++ b/webrtc/modules/video_coding/video_coding.gypi
@@ -14,6 +14,7 @@
       'dependencies': [
         'webrtc_h264',
         'webrtc_i420',
+        '../base/base.gyp:rtc_task_queue',
         '<(webrtc_root)/common_video/common_video.gyp:common_video',
         '<(webrtc_root)/modules/video_coding/utility/video_coding_utility.gyp:video_coding_utility',
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',