Pass in SW_SHOW to ShellExecuteEx as the plugin installers can rely on this...

webkit/default_plugin/plugin_impl.cc

Index: webkit/default_plugin/plugin_impl.cc
===================================================================
--- webkit/default_plugin/plugin_impl.cc	(revision 5246)
+++ webkit/default_plugin/plugin_impl.cc	(working copy)
@@ -618,10 +618,15 @@
     std::wstring file_path =
         reinterpret_cast<const wchar_t*>(download_file_info->lpData);
 
+    std::wstring current_directory =
+        file_util::GetDirectoryFromPath(file_path);
+
     SHELLEXECUTEINFO shell_execute_info = {0};
     shell_execute_info.cbSize = sizeof(shell_execute_info);
     shell_execute_info.fMask = SEE_MASK_NOCLOSEPROCESS;
     shell_execute_info.lpFile = file_path.c_str();
+    shell_execute_info.lpDirectory = current_directory.c_str();
+    shell_execute_info.nShow = SW_SHOW;
 
     if (!ShellExecuteEx(&shell_execute_info)) {
       DLOG(WARNING) << "Failed to launch plugin installer "