Content test launcher: Initialize globals to nullptr

content/public/test/test_launcher.cc

Index: content/public/test/test_launcher.cc
diff --git a/content/public/test/test_launcher.cc b/content/public/test/test_launcher.cc
index 1c615f532fd0d22a5570bcc59b21b1df3623fb41..ee92682c3b726d11697ee3f72e674da5f8c5e326 100644
--- a/content/public/test/test_launcher.cc
+++ b/content/public/test/test_launcher.cc
@@ -68,8 +68,8 @@ const char kPreTestPrefix[] = "PRE_";
 // add a new binary that must be compiled on all builds.
 const char kManualTestPrefix[] = "MANUAL_";
 
-TestLauncherDelegate* g_launcher_delegate;
-ContentMainParams* g_params;
+TestLauncherDelegate* g_launcher_delegate = nullptr;
+ContentMainParams* g_params = nullptr;
 
 std::string RemoveAnyPrePrefixes(const std::string& test_name) {
   std::string result(test_name);