[Sync] Replacing NULL with nullptr in code and null in comments for components/sync/

components/sync/test/fake_server/android/fake_server_helper_android.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/sync/test/fake_server/android/fake_server_helper_android.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <vector>
@@ skipping 155 matching lines @@
   fake_server_ptr->ModifyEntitySpecifics(
       base::android::ConvertJavaStringToUTF8(env, id), entity_specifics);
 }
 
 void FakeServerHelperAndroid::DeserializeEntitySpecifics(
     JNIEnv* env,
     jbyteArray serialized_entity_specifics,
     sync_pb::EntitySpecifics* entity_specifics) {
   int specifics_bytes_length = env->GetArrayLength(serialized_entity_specifics);
   jbyte* specifics_bytes =
-      env->GetByteArrayElements(serialized_entity_specifics, NULL);
+      env->GetByteArrayElements(serialized_entity_specifics, nullptr);
   std::string specifics_string(reinterpret_cast<char*>(specifics_bytes),
                                specifics_bytes_length);
 
   if (!entity_specifics->ParseFromString(specifics_string))
     NOTREACHED() << "Could not deserialize EntitySpecifics";
 }
 
 void FakeServerHelperAndroid::InjectBookmarkEntity(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj,
@@ skipping 119 matching lines @@
                                               jlong fake_server) {
   fake_server::FakeServer* fake_server_ptr =
       reinterpret_cast<fake_server::FakeServer*>(fake_server);
   fake_server_ptr->ClearServerData();
 }
 
 // static
 bool FakeServerHelperAndroid::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }