Fix license headers in a number of files

net/http/http_vary_data_unittest.cc

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// 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 "net/http/http_request_info.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_vary_data.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 126 matching lines @@
   a.Init("Cookie: 1", "HTTP/1.1 301 Moved\nLocation: x\nVary: coOkie\n\n");
 
   TestTransaction b;
   b.Init("Cookie: 2", "HTTP/1.1 301 Moved\nLocation: x\nVary: cooKie\n\n");
 
   net::HttpVaryData v;
   EXPECT_TRUE(v.Init(a.request, *a.response));
 
   EXPECT_FALSE(v.MatchesRequest(b.request, *b.response));
 }