Remove extra return statement left by mistake.

Bug: 1048607
Change-Id: Ibbedd53b59028d0b83459e41c9b728e063974318
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2035973Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Saurabh Nijhara <snijhara@google.com>
Cr-Commit-Position: refs/heads/master@{#738138}

chrome/browser/chromeos/policy/minimum_version_policy_handler.cc

@@ -52,7 +52,6 @@ MinimumVersionRequirement::CreateInstanceIfValid(
       eol_warning.has_value() ? eol_warning.value() : 0);
   return std::make_unique<MinimumVersionRequirement>(
       minimum_version, warning_time, eol_warning_time);
-  return nullptr;
 }
 
 int MinimumVersionRequirement::Compare(