Implement SysInfo::CPUArchitecture() on Windows.

base/sys_info_posix.cc

 // Copyright (c) 2011 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/sys_info.h"
 
 #include <errno.h>
 #include <string.h>
 #include <sys/param.h>
 #include <sys/utsname.h>
@@ skipping 61 matching lines @@
 }
 #endif
 
 // static
 std::string SysInfo::CPUArchitecture() {
   struct utsname info;
   if (uname(&info) < 0) {
     NOTREACHED();
     return "";
   }
-  return std::string(info.machine);
+  std::string arch(info.machine);
+  if (arch == "i386" || arch == "i486" || arch == "i586" || arch == "i686") {
+    arch = "x86";
+  } else if (arch == "amd64") {
+    arch = "x86_64";
+  }
+  return arch;
 }
 
 // static
 size_t SysInfo::VMAllocationGranularity() {
   return getpagesize();
 }
 
 }  // namespace base