Enable -Wsizeof-array-div on Windows as well.

The one instance was fixed in upstream Vulkan Loader early Dec 2019,
and we rolled that into angle yesterday.

Bug: 1002945
Change-Id: I524bea56f50776e6fb2453ae68fce9f8b3f709e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948231
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733985}

build/config/compiler/BUILD.gn

@@ -1552,13 +1552,6 @@ config("default_warnings") {
           "-Wno-deprecated-copy",
         ]
 
-        if (is_win) {
-          cflags += [
-            # TODO(https://crbug.com/1002945): Clean up, enable.
-            "-Wno-sizeof-array-div",
-          ]
-        }
-
         cflags_c += [
           # TODO(https://crbug.com/995993): Clean up and enable.
           "-Wno-implicit-fallthrough",