Fix license headers in a number of files

chrome/browser/metrics/metrics_response.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 "chrome/browser/metrics/metrics_response.h"
 
 #include "libxml/parser.h"
 
 // State to pass around during SAX parsing.
 struct SAXState {
   int collectors;
@@ skipping 60 matching lines @@
   SAXState state = {0};
 
   valid_ = !xmlSAXUserParseMemory(&handler, &state,
                                   response_xml.data(),
                                   static_cast<int>(response_xml.size()));
 
   collectors_ = state.collectors;
   events_ = state.events;
   interval_ = state.interval;
 }