Ensure tests check the return of SpawnChild() when they may wait without timeouts

base/shared_memory_unittest.cc

Index: base/shared_memory_unittest.cc
diff --git a/base/shared_memory_unittest.cc b/base/shared_memory_unittest.cc
index edcbb50083a4fcb6f5184d6ba8a52e32f26dfe0d..9472101cb741b59e9cda3d2bc0bb21f2f608eeca 100644
--- a/base/shared_memory_unittest.cc
+++ b/base/shared_memory_unittest.cc
@@ -383,6 +383,7 @@ TEST_F(SharedMemoryProcessTest, MAYBE_Tasks) {
   ProcessHandle handles[kNumTasks];
   for (int index = 0; index < kNumTasks; ++index) {
     handles[index] = SpawnChild("SharedMemoryTestMain", false);
+    ASSERT_TRUE(handles[index]);
   }
 
   int exit_code = 0;