Change gtest launcher to run in parallel and retry failures by default.

base/test/test_switches.cc

Index: base/test/test_switches.cc
diff --git a/base/test/test_switches.cc b/base/test/test_switches.cc
index d87acaf2308aa6ab5cd8ac0a5c6d1996d8fb8c34..2c9e673f77fbad9a1b37edd33cc4f426c7264dd0 100644
--- a/base/test/test_switches.cc
+++ b/base/test/test_switches.cc
@@ -13,6 +13,7 @@ const char switches::kTestLauncherBatchLimit[] = "test-launcher-batch-limit";
 
 // Sets defaults desirable for the continuous integration bots, e.g. parallel
 // test execution and test retries.
+// TODO(dpranke): Remove this once the bots no longer pass this.
 const char switches::kTestLauncherBotMode[] =
     "test-launcher-bot-mode";