Revert of Build services as standalone executables

services/service_manager/runner/host/host_unittests.cc

Index: services/service_manager/runner/host/host_unittests.cc
diff --git a/services/service_manager/runner/host/host_unittests.cc b/services/service_manager/runner/host/host_unittests.cc
index ed09c1c8317fc9ed8968bbf7daeadc9260546775..2e91efc04e28e585f6e0e47441dfedcaf1f24a5b 100644
--- a/services/service_manager/runner/host/host_unittests.cc
+++ b/services/service_manager/runner/host/host_unittests.cc
@@ -10,13 +10,22 @@
 #include "base/test/test_suite.h"
 #include "mojo/edk/embedder/embedder.h"
 #include "services/service_manager/runner/common/switches.h"
+#include "services/service_manager/runner/host/child_process.h"
 #include "services/service_manager/runner/init.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 int main(int argc, char** argv) {
   base::CommandLine::Init(argc, argv);
+  const base::CommandLine& command_line =
+      *base::CommandLine::ForCurrentProcess();
 
   service_manager::WaitForDebuggerIfNecessary();
+
+  if (command_line.HasSwitch(switches::kChildProcess)) {
+    base::AtExitManager at_exit;
+
+    return service_manager::ChildProcessMain();
+  }
 
   mojo::edk::Init();