Update from https://crrev.com/304121

base/test/launcher/unit_test_launcher.cc

Index: base/test/launcher/unit_test_launcher.cc
diff --git a/base/test/launcher/unit_test_launcher.cc b/base/test/launcher/unit_test_launcher.cc
index 44846a142d3485b21d8beab9c06407d418bd415f..a49e777f5e74dd423f2457d6667743e9416d5614 100644
--- a/base/test/launcher/unit_test_launcher.cc
+++ b/base/test/launcher/unit_test_launcher.cc
@@ -479,15 +479,6 @@ int LaunchUnitTestsInternal(const RunTestSuiteCallback& run_test_suite,
       fflush(stdout);
       force_single_process = true;
     }
-
-    if (RunningOnValgrind()) {
-      fprintf(stdout,
-              "Valgrind detected, switching to single process mode.\n"
-              "Pass --test-launcher-debug-launcher to valgrind the launcher "
-              "itself.\n");
-      fflush(stdout);
-      force_single_process = true;
-    }
   }
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(kGTestHelpFlag) ||