Update to Chromium //base at Chromium commit 3e81715e6d3a4324362635aea46ce1f1a163cca1.

test/launcher/unit_test_launcher.cc

Index: test/launcher/unit_test_launcher.cc
diff --git a/test/launcher/unit_test_launcher.cc b/test/launcher/unit_test_launcher.cc
index 7bd76925f858b0845971032dd70bbc59a63c248f..dc79f658aac5135691bc65a6c5c144e631f64e08 100644
--- a/test/launcher/unit_test_launcher.cc
+++ b/test/launcher/unit_test_launcher.cc
@@ -4,6 +4,7 @@
 
 #include "base/test/launcher/unit_test_launcher.h"
 
+#include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
@@ -180,6 +181,8 @@ int LaunchUnitTestsInternal(const RunTestSuiteCallback& run_test_suite,
   if (CommandLine::ForCurrentProcess()->HasSwitch(kGTestHelpFlag) ||
       CommandLine::ForCurrentProcess()->HasSwitch(kGTestListTestsFlag) ||
       CommandLine::ForCurrentProcess()->HasSwitch(kSingleProcessTestsFlag) ||
+      CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kTestChildProcess) ||
       force_single_process) {
     return run_test_suite.Run();
   }