[fuchsia] Remove uses of ZX_VMO_*NON_RESIZEABLE.

Zircon VMOs are now created non-resizeable by default. This family of
flags is now a no-op and they will soon be removed.

Bug: chromium:973981
Change-Id: I99b5a18b9744e32ebb3f33f1a848ee9b5c51eb0d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1659568
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62159}

src/base/platform/platform-fuchsia.cc

@@ -48,7 +48,7 @@ void* OS::Allocate(void* address, size_t size, size_t alignment,
   size_t request_size = size + (alignment - page_size);
 
   zx_handle_t vmo;
-  if (zx_vmo_create(request_size, ZX_VMO_NON_RESIZABLE, &vmo) != ZX_OK) {
+  if (zx_vmo_create(request_size, 0, &vmo) != ZX_OK) {
     return nullptr;
   }
   static const char kVirtualMemoryName[] = "v8-virtualmem";