Reenable BufferMappedAtCreationOOM on Windows

It was suppressed because PartitionAlloc didn't support new
(std::nothrow). Reenable the test now that ParitionAlloc
supports it.

Fixed: dawn:579
Change-Id: I4d3879ae78ee869d08bb249857af7782a6f7f443
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/34465
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Auto-Submit: Corentin Wallez <cwallez@chromium.org>

src/tests/end2end/BufferTests.cpp

@@ -728,10 +728,6 @@ TEST_P(BufferTests, BufferMappedAtCreationOOM) {
     DAWN_SKIP_TEST_IF(IsOpenGLES());
     DAWN_SKIP_TEST_IF(IsAsan());
 
-    // TODO(http://crbug.com/dawn/579): PartitionAlloc raises an exception on OOM even with
-    // std::no_throw.
-    DAWN_SKIP_TEST_IF(IsWindows());
-
     // Test non-mappable buffer
     {
         wgpu::BufferDescriptor descriptor;