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/+/1993964Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730123}

build/config/compiler/BUILD.gn

@@ -143,10 +143,11 @@ 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):
+  # TODO(vitalybuka): investigate why some debug windows bots fail tests.
   # 'is_android' breaks content_shell_test_apk on android-kitkat-arm-rel.
   # 'use_xcode_clang' may call old clang.
-  init_stack_vars = !is_android && !use_xcode_clang && !is_official_build
+  init_stack_vars = !is_android && !(is_win && is_debug) && !use_xcode_clang &&
+                    !is_official_build
 }
 
 declare_args() {