Refactor Pickle Read methods to use higher performance PickleIterator.

net/http/http_response_headers_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 <algorithm>
 
 #include "base/basictypes.h"
 #include "base/pickle.h"
 #include "base/time.h"
 #include "net/http/http_response_headers.h"
@@ skipping 457 matching lines @@
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
     std::string headers = tests[i].raw_headers;
     HeadersToRaw(&headers);
     scoped_refptr<net::HttpResponseHeaders> parsed1(
         new net::HttpResponseHeaders(headers));
 
     Pickle pickle;
     parsed1->Persist(&pickle, tests[i].options);
 
-    void* iter = NULL;
+    PickleIterator iter(pickle);
     scoped_refptr<net::HttpResponseHeaders> parsed2(
         new net::HttpResponseHeaders(pickle, &iter));
 
     std::string h2;
     parsed2->GetNormalizedHeaders(&h2);
     EXPECT_EQ(std::string(tests[i].expected_headers), h2);
   }
 }
 
 TEST(HttpResponseHeadersTest, EnumerateHeader_Coalesced) {
@@ skipping 1260 matching lines @@
         new net::HttpResponseHeaders(orig_headers));
 
     std::string name(tests[i].new_status);
     parsed->ReplaceStatusLine(name);
 
     std::string resulting_headers;
     parsed->GetNormalizedHeaders(&resulting_headers);
     EXPECT_EQ(std::string(tests[i].expected_headers), resulting_headers);
   }
 }