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This CL attempts to fix a bug where calling
WebContents::DecrementCapturerCount in the callback passed to
PaintPreviewClient can result in reloading a crashed render frame.
This is problematic and crashes if it occurs inside RenderFrameDeleted
and PaintPreviewClient::OnFinished is invoked. By posting the callback
it should be invoked after RenderFrameDeleted cleanup is done resulting
in DecrementCapturerCount no longer being called inside
RenderFrameDeleted.

Bug: 1146573
Change-Id: Iccb612d89135e058d8fc06de018e7c95cd91657a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595247
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Commit-Queue: Mehran Mahmoudi <mahmoudi@chromium.org>
Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837649}