Run clang-modernize -use-nullptr over src/extensions/.

extensions/common/manifest_handlers/file_handler_info.cc

Index: extensions/common/manifest_handlers/file_handler_info.cc
diff --git a/extensions/common/manifest_handlers/file_handler_info.cc b/extensions/common/manifest_handlers/file_handler_info.cc
index 1323252cab9a385404f60689b24ab0fa405eff56..2be9582e36d3d4dfdf44b2bb31da6ad0b7c13eb4 100644
--- a/extensions/common/manifest_handlers/file_handler_info.cc
+++ b/extensions/common/manifest_handlers/file_handler_info.cc
@@ -34,7 +34,7 @@ const FileHandlersInfo* FileHandlers::GetFileHandlers(
     const Extension* extension) {
   FileHandlers* info = static_cast<FileHandlers*>(
       extension->GetManifestData(keys::kFileHandlers));
-  return info ? &info->file_handlers : NULL;
+  return info ? &info->file_handlers : nullptr;
 }
 
 FileHandlersParser::FileHandlersParser() {
@@ -53,7 +53,7 @@ bool LoadFileHandler(const std::string& handler_id,
 
   handler.id = handler_id;
 
-  const base::ListValue* mime_types = NULL;
+  const base::ListValue* mime_types = nullptr;
   if (handler_info.HasKey(keys::kFileHandlerTypes) &&
       !handler_info.GetList(keys::kFileHandlerTypes, &mime_types)) {
     *error = ErrorUtils::FormatErrorMessageUTF16(
@@ -61,7 +61,7 @@ bool LoadFileHandler(const std::string& handler_id,
     return false;
   }
 
-  const base::ListValue* file_extensions = NULL;
+  const base::ListValue* file_extensions = nullptr;
   if (handler_info.HasKey(keys::kFileHandlerExtensions) &&
       !handler_info.GetList(keys::kFileHandlerExtensions, &file_extensions)) {
     *error = ErrorUtils::FormatErrorMessageUTF16(
@@ -124,7 +124,7 @@ bool LoadFileHandler(const std::string& handler_id,
 
 bool FileHandlersParser::Parse(Extension* extension, base::string16* error) {
   scoped_ptr<FileHandlers> info(new FileHandlers);
-  const base::DictionaryValue* all_handlers = NULL;
+  const base::DictionaryValue* all_handlers = nullptr;
   if (!extension->manifest()->GetDictionary(keys::kFileHandlers,
                                             &all_handlers)) {
     *error = base::ASCIIToUTF16(errors::kInvalidFileHandlers);
@@ -135,7 +135,7 @@ bool FileHandlersParser::Parse(Extension* extension, base::string16* error) {
   for (base::DictionaryValue::Iterator iter(*all_handlers);
        !iter.IsAtEnd();
        iter.Advance()) {
-    const base::DictionaryValue* handler = NULL;
+    const base::DictionaryValue* handler = nullptr;
     if (iter.value().GetAsDictionary(&handler)) {
       if (!LoadFileHandler(iter.key(),
                            *handler,