Style Change: NULL->nullptr

tests/DiscardableMemoryTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDiscardableMemory.h"
 
 #include "Test.h"
 
 DEF_TEST(DiscardableMemory, reporter) {
     const char testString[] = "HELLO, WORLD!";
     const size_t len = sizeof(testString);
     SkAutoTDelete<SkDiscardableMemory> dm(SkDiscardableMemory::Create(len));
-    REPORTER_ASSERT(reporter, dm.get() != NULL);
-    if (NULL == dm.get()) {
+    REPORTER_ASSERT(reporter, dm.get() != nullptr);
+    if (nullptr == dm.get()) {
         return;
     }
     void* ptr = dm->data();
-    REPORTER_ASSERT(reporter, ptr != NULL);
+    REPORTER_ASSERT(reporter, ptr != nullptr);
     memcpy(ptr, testString, sizeof(testString));
     dm->unlock();
     bool success = dm->lock();
     REPORTER_ASSERT(reporter, success);
     if (!success) {
         return;
     }
     ptr = dm->data();
     REPORTER_ASSERT(reporter, 0 == memcmp(ptr, testString, len));
     dm->unlock();
 }