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This reverts commit 2e28f009.

Reason for revert: suspecting to cause crashes, http://crbug.com/1052107

Original change's description:
> Remove ScriptContext::ScopedFrameDocumentLoader
> 
> This scope is used to map Frame to just-about-to-commit DocumentLoader.
> 
> With https://crrev.com/706529, we now call ReadyToCommitNavigation
> after the commit (as opposite to before the commit). Therefore,
> WebLocalFrame::GetDocumentLoader is already the right one and we don't
> need a scoped mapping.
> 
> Bug: 855189
> Change-Id: I95621b00ee4391986f063e56f20d8d7d25b5c532
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2046210
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#740198}

TBR=dgozman@chromium.org,rdevlin.cronin@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 855189
Change-Id: I7021f96e4c6db2a41f048113b369eee7a21b07ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083390Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746166}