C++11 declares a type safe null pointer

content/common/sandbox_mac_unittest_helper.h

Index: content/common/sandbox_mac_unittest_helper.h
diff --git a/content/common/sandbox_mac_unittest_helper.h b/content/common/sandbox_mac_unittest_helper.h
index a3c06947759acd5219476eb90c7cb2f985005634..a16c61c38443bb71ccac99d937167ec60a833d84 100644
--- a/content/common/sandbox_mac_unittest_helper.h
+++ b/content/common/sandbox_mac_unittest_helper.h
@@ -36,7 +36,7 @@ namespace content {
 //  TEST_F(MacSandboxTest, ATest) {
 //    EXPECT_TRUE(RunTestInAllSandboxTypes(
 //                    "TestCaseThatRunsInSandboxedSubprocess",
-//                    NULL));
+//                    nullptr));
 //  }
 
 // Base test type with helper functions to spawn a subprocess that exercises
@@ -45,8 +45,8 @@ class MacSandboxTest : public base::MultiProcessTest {
  public:
   // Runs a test specified by |test_name| in a sandbox of the type specified
   // by |sandbox_type|. |test_data| is a custom string that a test can pass
-  // to the child process runing in the sandbox, or NULL if additional data is
-  // required.
+  // to the child process runing in the sandbox, or nullptr if additional data
+  // is required.
   // Returns true if the test passes, false if either of the functions in
   // the corresponding MacSandboxTestCase return false.
   bool RunTestInSandbox(content::SandboxType sandbox_type,