Remove wow_helper.exe from Win 7 and higher.

chrome/installer/setup/install_worker.cc

Index: chrome/installer/setup/install_worker.cc
diff --git a/chrome/installer/setup/install_worker.cc b/chrome/installer/setup/install_worker.cc
index 73fb098258743ef5f65c9cf0c613bcf22ac56e79..b52db1ddd2fe248d778f998ba6c7d92f2e1ed4cd 100644
--- a/chrome/installer/setup/install_worker.cc
+++ b/chrome/installer/setup/install_worker.cc
@@ -753,8 +753,10 @@ void AddInstallWorkItems(const InstallationState& original_state,
   // Extra executable for 64 bit systems.
   // NOTE: We check for "not disabled" so that if the API call fails, we play it
   // safe and copy the executable anyway.
+  // NOTE: the file wow_helper.exe is only needed for Vista and below.
   if (base::win::OSInfo::GetInstance()->wow64_status() !=
-      base::win::OSInfo::WOW64_DISABLED) {
+      base::win::OSInfo::WOW64_DISABLED &&
+      base::win::GetVersion() <= base::win::VERSION_VISTA) {

[grt (UTC plus 2), 2012/01/31 21:27:56]

I think you're about to shave a yak.  Server 2008 is nearly Vista, whereas
Server 2008 R2 is nearly Win7.  windows_version.cc doesn't handle this
distinction, but I suspect the difference matters here: wow_helper is probably
needed for Server 2008 but not Server 2008 R2.  I think the right thing to do is
to give OSInfo::OSInfo in windows_version.cc the power to distinguish these. 
See
http://msdn.microsoft.com/en-us/library/windows/desktop/ms724833(v=vs.85).aspx
for details.

[arthurhsu, 2012/01/31 22:07:35]

Please refer to Ricardo's reply.  BTW, I copied the condition check that Ricardo
mentioned from chromium/src/sandbox/src/interception.cc:427.

[grt (UTC plus 2), 2012/02/01 02:12:17]

Cool, thanks for the confirmation, Ricardo.

     install_list->AddMoveTreeWorkItem(
         src_path.Append(installer::kWowHelperExe).value(),
         target_path.Append(installer::kWowHelperExe).value(),