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This reverts commit 532b7d7a.

Reason for revert: 794139

Original change's description:
> Fix Android WebView crash when an app loads a JavaScript URL during navigation.
> 
> When there's an ongoing navigation, if the app loada a JavaScript URL we create
> a temporary NavigationRequest in NavigatorImpl::RequestNavigation. However the
> call to RenderFrameHostManager::GetFrameHostForNavigation was resetting the
> speculative RFH of the original NavigationRequest since the site instance of a
> JavaScript load is always the same as the existing frame.
> 
> Bug: 793432
> Change-Id: I5a25eea9a8733cd5cebe71f700b30ebb4c0b1710
> Reviewed-on: https://chromium-review.googlesource.com/820453
> Commit-Queue: John Abd-El-Malek <jam@chromium.org>
> Reviewed-by: Nasko Oskov <nasko@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#523264}

TBR=nasko@chromium.org,jam@chromium.org

Change-Id: I1e08c1de84199879576782a8719e4a771d66248b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 793432
Reviewed-on: https://chromium-review.googlesource.com/822610Reviewed-by: Peter Conn <peconn@chromium.org>
Commit-Queue: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523418}