Revert of win: Update to Win 10 SDK

Revert of win: Update to Win 10 SDK (patchset #7 id:120001 of https://codereview.chromium.org/1378153003/ )

Reason for revert:
Suspected of causing compile timeouts on Win builders.

e.g. http://build.chromium.org/p/chromium.win/builders/Win%20Builder/builds/14141

OTOH, all trybots were fine, I can't repro in a VM, and some of the compiles on waterfall are fine. So... needs some investigation.

Original issue's description:
> win: Update to Win 10 SDK
>
> Tested on clean Win7 VM against both VS2013 and clang=1 at 247874-1.
>
> NaCl roll has to be included here because clang-cl warns if _WIN32_WINNT differs when building NaCl in Chrome. Roll includes:
>
> https://chromium.googlesource.com/native_client/src/native_client/+log/719fce7fa0..9c69f1fcb3
>
> d:\src\cr3\src>git log 719fce7fa0c1f11cf05d5c20cdfa6648e8a35611..9c69f1fcb35b34f136da7ea7c91ceb743b9d2aaa --pretty=oneline
> 9c69f1fcb35b34f136da7ea7c91ceb743b9d2aaa win: Update to Windows 10 SDK
> bc87a5bbc9664e22fcfe01786d501d70f198b22f Update revision for PNaCl
> 8d12493d902fec4c91dc949ab3a553c680b354a5 Use -fgnu-inline-asm for non-SFI IRT GYP build
> a27e828a3f1408197fbe39a5649e0b12f5b83e5d PNaCl: Update llvm and subzero revision in pnacl/COMPONENT_REVISIONS
> 11234b3082981faaf98b3045b907e19dd15b2737 Make ncval_annotate accept command-line options for paths.
> 0825b8b3e036f434375963458f090287e98be57f Fix failure of NaClHostDirOpen("/") on windows
> b73b0a27a2f833e7937c69dcbceda60cf522cd24 Add a test for x86-32 IRT stack realignment
> 67569a6bf3dfbdc8392e3aed95fcab4a3b49865b Add --finalize option to pnacl-ld
> 89c677938dec5ee5460c40731f5a4028c5c39527 Build non-SFI version of sandboxed binaries
> 9906fe25373ca728aed81a6a3e944a42c0603298 Remove per-file *.gn from OWNERS
> 564d7b6489425339c1a4d667874f51a3ce3d8b0f Add x86 and x64 into the list of supported PNaCl architectures
> ea4179990a6d0a3570ca53fcd6d898df6ef0a408 PNaCl: Remove the -allow-asm option
> 8a68b7b483492ebd918b7cbd315a3b7738b2efee PNaCl: Update llvm revision in pnacl/COMPONENT_REVISIONS
> 04d56826368fc7fcd5a802c1e3794c1abb4b3978 Build support for fnl.
> dafabd1973dad64651ab2ed93fabec9415843ff4 GN: Conditionalize x86-specific validator bits
> 9f06ea989d1257827a402be1b45cd0450296959a [Docs] Add wiki content to Markdown docs
> 644c971c7e492740d0fe0f997b9f5b01a23727fc PNaCl: Update subzero revision in pnacl/COMPONENT_REVISIONS
> 13f84b78ff6a702434b1501fc06643a4c1721998 debug_stub: Avoid unused const warning on non-x86 builds
>
> R=brucedawson@chromium.org
> BUG=491424
>
> Committed: https://crrev.com/3f6f89251dc210b24a36398237d374a87d4a3b33
> Cr-Commit-Position: refs/heads/master@{#352667}

TBR=brucedawson@chromium.org,sky@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=491424
Committed: https://crrev.com/2adcdde0c31366f8b6a5a1f6deb301abbd92e91f
Cr-Commit-Position: refs/heads/master@{#352714}

[scottmg, 2015-10-06 23:39:26]

Created Revert of win: Update to Win 10 SDK

[commit-bot: I haz the power, 2015-10-06 23:42:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1390923002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1390923002/1

[commit-bot: I haz the power, 2015-10-06 23:47:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-06 23:49:09]

Patchset 1 (id:??) landed as
https://crrev.com/2adcdde0c31366f8b6a5a1f6deb301abbd92e91f
Cr-Commit-Position: refs/heads/master@{#352714}

[brucedawson, 2015-10-07 00:01:34]

lgtm