Rewrite scoped_ptr<T>(NULL) to use the default ctor in chrome/.

chrome/browser/extensions/api/web_request/form_data_parser_unittest.cc

 // Copyright (c) 2012 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 "base/basictypes.h"
 #include "base/strings/string_piece.h"
 #include "chrome/browser/extensions/api/web_request/form_data_parser.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
 
 namespace {
 
 // Attempts to create a parser corresponding to the |content_type_header|.
 // On success, returns the parser.
 scoped_ptr<FormDataParser> InitParser(
     const std::string& content_type_header,
     std::vector<std::string>* output) {
   if (output == NULL)
-    return scoped_ptr<FormDataParser>(NULL);
+    return scoped_ptr<FormDataParser>();
   output->clear();
   scoped_ptr<FormDataParser> parser(
       FormDataParser::CreateFromContentTypeHeader(&content_type_header));
   if (parser.get() == NULL)
-    return scoped_ptr<FormDataParser>(NULL);
+    return scoped_ptr<FormDataParser>();
   return parser.Pass();
 }
 
 // Attempts to run the parser corresponding to the |content_type_header|
 // on the source represented by the concatenation of blocks from |bytes|.
 // On success, returns true and the parsed |output|, else false.
 // Parsed |output| has names on even positions (0, 2, ...), values on odd ones.
 bool RunParser(const std::string& content_type_header,
                const std::vector<const base::StringPiece*>& bytes,
                std::vector<std::string>* output) {
@@ skipping 194 matching lines @@
   // Fourth test: empty URL-encoded POST data. Note that an empty string is a
   // valid url-encoded value, so this should parse correctly.
   std::vector<std::string> output;
   input.clear();
   input.push_back(&kUrlEncodedBytesEmpty);
   EXPECT_TRUE(RunParser(kUrlEncoded, input, &output));
   EXPECT_EQ(0u, output.size());
 }
 
 }  // namespace extensions