Changing SpawnChild to return a struct.

base/process/process_metrics_unittest.cc

Index: base/process/process_metrics_unittest.cc
diff --git a/base/process/process_metrics_unittest.cc b/base/process/process_metrics_unittest.cc
index 3e059b48a45f565f0bbe6f12060a19e8ada834f6..9dcfe4e8b8620bd2bd4eba05076a5cb0df75c61d 100644
--- a/base/process/process_metrics_unittest.cc
+++ b/base/process/process_metrics_unittest.cc
@@ -491,8 +491,9 @@ TEST(ProcessMetricsTest, GetOpenFdCount) {
   const FilePath temp_path = temp_dir.GetPath();
   CommandLine child_command_line(GetMultiProcessTestChildBaseCommandLine());
   child_command_line.AppendSwitchPath(kTempDirFlag, temp_path);
-  Process child = SpawnMultiProcessTestChild(
+  SpawnChildResult spawn_result = SpawnMultiProcessTestChild(
       ChildMainString, child_command_line, LaunchOptions());
+  Process child = std::move(spawn_result.process);
   ASSERT_TRUE(child.IsValid());
   WaitForEvent(temp_path, kSignalClosed);