Improve process launch handle sharing API.

base/win/wait_chain_unittest.cc

Index: base/win/wait_chain_unittest.cc
diff --git a/base/win/wait_chain_unittest.cc b/base/win/wait_chain_unittest.cc
index d5814916150fa4bf36a0b73499f20036cd16c54f..60b0c6d1837ee5181f367f872dd2f0f73f4016e3 100644
--- a/base/win/wait_chain_unittest.cc
+++ b/base/win/wait_chain_unittest.cc
@@ -190,10 +190,8 @@ Process StartChildProcess(HANDLE mutex, HANDLE sync_event) {
   AppendSwitchHandle(&command_line, "sync_event", sync_event);
 
   LaunchOptions options;
-  HandlesToInheritVector handle_vector;
-  handle_vector.push_back(mutex);
-  handle_vector.push_back(sync_event);
-  options.handles_to_inherit = &handle_vector;
+  options.handles_to_inherit.push_back(mutex);
+  options.handles_to_inherit.push_back(sync_event);
   base::SpawnChildResult spawn_result =
       SpawnMultiProcessTestChild("WaitChainTestProc", command_line, options);
   return std::move(spawn_result.process);