Simplify VersionInfo code, avoid hitting sandbox IPC constantly on Windows

chrome/common/cloud_print/cloud_print_helpers.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 "chrome/common/cloud_print/cloud_print_helpers.h"
 
 #include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/md5.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/rand_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/sys_info.h"
 #include "base/values.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/cloud_print/cloud_print_constants.h"
 #include "net/base/mime_util.h"
 #include "url/gurl.h"
 
 namespace cloud_print {
 
 namespace {
 
 // Returns printer tags generated from |printer_tags| and the default tags
 // required by cloud print server.
 PrinterTags PreparePrinterTags(const PrinterTags& printer_tags) {
   PrinterTags printer_tags_out = printer_tags;
   chrome::VersionInfo version_info;
-  DCHECK(version_info.is_valid());
   printer_tags_out[kChromeVersionTagName] =
       version_info.CreateVersionString();
   printer_tags_out[kSystemNameTagName] =
       base::SysInfo::OperatingSystemName();
   printer_tags_out[kSystemVersionTagName] =
       base::SysInfo::OperatingSystemVersion();
   return printer_tags_out;
 }
 
 // Returns the hash of |printer_tags|.
@@ skipping 204 matching lines @@
   net::AddMultipartValueForUpload(kPrinterTagValue, tags_hash_msg,
       mime_boundary, std::string(), &post_data);
   return post_data;
 }
 
 std::string GetCloudPrintAuthHeader(const std::string& auth_token) {
   return base::StringPrintf("Authorization: OAuth %s", auth_token.c_str());
 }
 
 }  // namespace cloud_print