Exit the installer gracefully if the processor doesn't support SSE2.

chrome/installer/setup/setup_util.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.
 //
 // This file declares util functions for setup project.
 
 #include "chrome/installer/setup/setup_util.h"
 
 #include <windows.h>
 
 #include "base/command_line.h"
+#include "base/cpu.h"
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/process/kill.h"
 #include "base/process/launch.h"
 #include "base/process/process_handle.h"
 #include "base/strings/string_util.h"
 #include "base/version.h"
 #include "base/win/registry.h"
@@ skipping 420 matching lines @@
     "chrome-frame",
     "migrate-chrome-frame",
   };
   for (size_t i = 0; i < arraysize(kLegacySwitches); ++i) {
     if (cmd_line.HasSwitch(kLegacySwitches[i]))
       return true;
   }
   return false;
 }
 
+bool IsProcessorSupported() {
+  return base::CPU().has_sse2();
+}
+
 ScopedTokenPrivilege::ScopedTokenPrivilege(const wchar_t* privilege_name)
     : is_enabled_(false) {
   HANDLE temp_handle;
   if (!::OpenProcessToken(::GetCurrentProcess(),
                           TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY,
                           &temp_handle)) {
     return;
   }
   token_.Set(temp_handle);
 
@@ skipping 21 matching lines @@
 }
 
 ScopedTokenPrivilege::~ScopedTokenPrivilege() {
   if (is_enabled_ && previous_privileges_.PrivilegeCount != 0) {
     ::AdjustTokenPrivileges(token_, FALSE, &previous_privileges_,
                             sizeof(TOKEN_PRIVILEGES), NULL, NULL);
   }
 }
 
 }  // namespace installer