Convert NULL to nullptr

util/mach/exception_ports_test.cc

Index: util/mach/exception_ports_test.cc
diff --git a/util/mach/exception_ports_test.cc b/util/mach/exception_ports_test.cc
index 7e98a41d1e4bb2133207749e2f1926bc8fb654cd..9007305e5341e7dbbf10437945618baa3f506f2d 100644
--- a/util/mach/exception_ports_test.cc
+++ b/util/mach/exception_ports_test.cc
@@ -186,7 +186,7 @@ class TestExceptionPorts : public UniversalMachExcServer,
     // function returning type void, and the interface dictates otherwise here.
     if (exception == EXC_CRASH && code_count >= 1) {
       int signal;
-      ExcCrashRecoverOriginalException(code[0], NULL, &signal);
+      ExcCrashRecoverOriginalException(code[0], nullptr, &signal);
 
       // The child crashed with a division by zero, which shows up as SIGFPE.
       // This was chosen because it’s unlikely to be generated by testing or
@@ -231,7 +231,7 @@ class TestExceptionPorts : public UniversalMachExcServer,
         }
       }
 
-      int rv_int = pthread_create(&thread_, NULL, ThreadMainThunk, this);
+      int rv_int = pthread_create(&thread_, nullptr, ThreadMainThunk, this);
       ASSERT_EQ(0, rv_int);
 
       // Wait for the new thread to be ready.
@@ -271,7 +271,7 @@ class TestExceptionPorts : public UniversalMachExcServer,
       }
 
       // Reap the other thread.
-      rv_int = pthread_join(thread_, NULL);
+      rv_int = pthread_join(thread_, nullptr);
       ASSERT_EQ(0, rv_int);
     }
 
@@ -320,7 +320,7 @@ class TestExceptionPorts : public UniversalMachExcServer,
         Crash();
       }
 
-      return NULL;
+      return nullptr;
     }
 
     // Crashes by performing a division by zero. The assignment is present to