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We don't want to Send() IPCs on a frozen/provisional RenderWidget. The
DoDeferredClose path in RenderWidget needs to send the IPC from a fresh
call stack, but in the meantime, the RenderWidget may have become
frozen (the main frame may have been swapped out in that RenderWidget's
RenderView).

In that case, we still allow the WidgetHostMsg_Close to go through, and
behave as if the IPC was already in transit to the browser. But since
RenderWidget::Send() should not be used, we use a static method.

This is one step toward allowing us to CHECK() that we don't Send()
IPCs from frozen/provisional RenderWidgets.

R=dcheng@chromium.org

Bug: 419087, 745091
Change-Id: I85f707c3c9bf071f7adf6273d78d40a6f530b10b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1733852
Auto-Submit: danakj <danakj@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683782}