Add RetainedRef uses where needed.

base/test/launcher/test_launcher.cc

Index: base/test/launcher/test_launcher.cc
diff --git a/base/test/launcher/test_launcher.cc b/base/test/launcher/test_launcher.cc
index e7ab873a2d247ad4a06b47ee47512551170e3ae5..6aeee1883a2c84f0739176785340552165014933 100644
--- a/base/test/launcher/test_launcher.cc
+++ b/base/test/launcher/test_launcher.cc
@@ -537,10 +537,11 @@ void TestLauncher::LaunchChildGTestProcess(
   bool redirect_stdio = (parallel_jobs_ > 1) || BotModeEnabled();
 
   worker_pool_owner_->pool()->PostWorkerTask(
-      FROM_HERE, Bind(&DoLaunchChildTestProcess, new_command_line, timeout,
-                      flags, redirect_stdio, ThreadTaskRunnerHandle::Get(),
-                      Bind(&TestLauncher::OnLaunchTestProcessFinished,
-                           Unretained(this), callback)));
+      FROM_HERE,
+      Bind(&DoLaunchChildTestProcess, new_command_line, timeout, flags,
+           redirect_stdio, RetainedRef(ThreadTaskRunnerHandle::Get()),
+           Bind(&TestLauncher::OnLaunchTestProcessFinished, Unretained(this),
+                callback)));
 }
 
 void TestLauncher::OnTestFinished(const TestResult& result) {