This reverts commit 70155edf.

Reason for revert: the 15.4 toolchain breaks incremental linking for
Chrome (crbug.com/780161)

Original change's description:
> VS 2017 15.4 with 10.0.15063.468 SDK
> 
> This change switches the VS 2017 package to use VS 2017 Update 4 while
> still using the 10.0.15063.468 SDK. Update 4 fixes at least one code-gen
> bug (crbug.com/759402) but the 10.0.16299.0 SDK is still incompatible
> with Chrome (crbug.com/773476).
> 
> Packaging was done on a Windows Server 2016 VM, cleanly created for this
> purpose.
> 
> Compiler was packaged up by downloading VS 2017 Update 4, from
> https://www.visualstudio.com/vs/, and then passing these parameters to
> the installer:
> 
>     --add Microsoft.VisualStudio.Workload.NativeDesktop
>     --add Microsoft.VisualStudio.Component.VC.ATLMFC --includeRecommended
>     --passive
> 
> Then the Windows 10.0.15063.468 SDK installer was run and everything was
> installed except for the Windows Performance Toolkit, .Net Framework,
> and the arm SDKs.
> 
> Then the packaging script was run like this:
> 
>     python depot_tools\win_toolchain\package_from_installed.py 2017 -w 10.0.15063.0
> 
> Bug: 773476,759402
> Change-Id: Ie2176b5ff765d9e5497f51a7b00c02fad04fb973
> Reviewed-on: https://chromium-review.googlesource.com/727523


> Reviewed-by: Scott Graham <scottmg@chromium.org>
> Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#510207}

TBR=thakis@chromium.org,brucedawson@chromium.org,scottmg@chromium.org

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

Bug: 773476, 759402
Change-Id: Ica63e9740c954499b85ee891fb3bec0d48dd70fb
Reviewed-on: https://chromium-review.googlesource.com/753422


Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513965}