[roll] Roll fuchsia Revert "[sestarnix] Remove conflicting gtest helper"

This reverts commit 1b0821b1a658c9e04c09799898e985aa462fea80.

Reason for revert: Failing core.x64-asan-cxx_determinism-build_only

Original-Bug: None
Original change's description:
> [sestarnix] Remove conflicting gtest helper
>
> The starnix test helper defines `SyscallSucceeds`.
> The sestarnix test helper defines its own `SyscallSucceeds`,
> with a slightly different API.
>
> The 2 definitions conflict, preventing the use of the starnix
> test helper in the sestarnix tests.
>
> This CL removes the sestarnix version of `SyscallSucceeds`.
> As a cleanup it also removes the sestarnix version of
> `SyscallFailsWithErrno`.
>
> Original-Bug: None
> Change-Id: I78ca747efafefc02cf381361663c7beb578a9b2d
> Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1264464
> Commit-Queue: Jean-François Geyelin <jif@google.com>
> Reviewed-by: Ambre Williams <ambre@google.com>

Original-Bug: None
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1266789
Original-Revision: ee9fe386579953a5977da9b5c6f89a7862dc2600
GitOrigin-RevId: 0f613b6bd9ea967f93c52d2bd7f4b5af828b3ca7
Change-Id: If5371073ff19f8550ac4eac13d5780361043c800
diff --git a/stem b/stem
index b26045a..79df521 100644
--- a/stem
+++ b/stem
@@ -8,7 +8,7 @@
              root=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="75ac3a1264bc9075c8f2552327f99a2c4fa3f921"
+             revision="ee9fe386579953a5977da9b5c6f89a7862dc2600"
              />
   </imports>
   <projects>