Reland "Enable init_stack_vars for non-official Debug Windows builds"

This reverts commit 8fb47ccd.

Reason for revert:
Fixed: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/1995823
Rolled: crrev.com/c/1998818

Original change's description:
> Revert "Enable init_stack_vars for non-official Debug Windows builds"
>
> This reverts commit d140b7a4.
>
> Reason for revert: Broke crashpad_tests reliably
> https://ci.chromium.org/p/chromium/builders/ci/Win10%20Tests%20x64%20%28dbg%29/12597
>
> Original change's description:
> > Enable init_stack_vars for non-official Debug Windows builds
> >
> > Debug build is fixed with: crrev.com/c/1973353
> >
> > Bug: 977230, 1030261
> > Change-Id: Idcb24d092247f6bc7438c74b6405b4b93539507d
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1970852
> > Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
> > Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
> > Reviewed-by: Hans Wennborg <hans@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#728840}
>
> TBR=hans@chromium.org,vitalybuka@chromium.org
>
> # Not skipping CQ checks because original CL landed > 1 day ago.
>
> Bug: 977230, 1030261
> Change-Id: Iad7d92e12299365b4a45a5237c3bc5e371e33dbe
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1993964
> Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
> Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#730123}

TBR=vasilii@chromium.org,hans@chromium.org,vitalybuka@chromium.org

Change-Id: Icccde6c0629968511d14368f00586f5cf40226e6
Bug: 977230, 1030261
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1995988
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731762}

build/config/compiler/BUILD.gn

@@ -143,11 +143,10 @@ declare_args() {
   # rest with 0xAA. This makes behavior of uninitialized memory bugs consistent,
   # recognizeble in debugger, and crashes memory accesses by uninitialized
   # pointers.
-  # TODO(vitalybuka): investigate why some debug windows bots fail tests.
+  # TODO(vitalybuka):
   # 'is_android' breaks content_shell_test_apk on android-kitkat-arm-rel.
   # 'use_xcode_clang' may call old clang.
-  init_stack_vars = !is_android && !(is_win && is_debug) && !use_xcode_clang &&
-                    !is_official_build
+  init_stack_vars = !is_android && !use_xcode_clang && !is_official_build
 }
 
 declare_args() {