Do not check result of SetAlternateDesktop

Fixed regression introduced by
https://codereview.chromium.org/1415483008
Seems comment nearby was not noticed.

BUG=581134

Review URL: https://codereview.chromium.org/1638773002

Cr-Commit-Position: refs/heads/master@{#371533}

chrome/service/service_utility_process_host.cc

@@ -67,9 +67,10 @@ class ServiceSandboxedProcessLauncherDelegate
   ServiceSandboxedProcessLauncherDelegate() {}
 
   bool PreSpawnTarget(sandbox::TargetPolicy* policy) override {
-    // Service process may run as windows service and it fails to create a
-    // window station.
-    return policy->SetAlternateDesktop(false) == sandbox::SBOX_ALL_OK;
+    // Ignore result of SetAlternateDesktop. Service process may run as windows
+    // service and it fails to create a window station.
+    base::IgnoreResult(policy->SetAlternateDesktop(false));
+    return true;
   }
 
  private: