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Before NavigationLoaderOnUI, SXG related code are executed on IO thread.
So we need to use PostTask() to UI thread to get FrameTreeNode.
But now they are executed on UI thread. We don't need to use PostTask().

Bug: 824854
Change-Id: I5bff6782ec0ba9bda0d9f930d13f92d009711cd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873814Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708506}