Experimentally isolate OpenItemViaShell in a utility process.

chrome/utility/shell_handler_win.cc

Index: chrome/utility/shell_handler_win.cc
diff --git a/chrome/utility/shell_handler_win.cc b/chrome/utility/shell_handler_win.cc
index 7337f9aa6ed4db05ada990cb63d26a88e204dfe1..9edd0427b40b979113bb797920c56193a1aa9e2f 100644
--- a/chrome/utility/shell_handler_win.cc
+++ b/chrome/utility/shell_handler_win.cc
@@ -11,6 +11,7 @@
 #include "chrome/common/chrome_utility_messages.h"
 #include "content/public/utility/utility_thread.h"
 #include "ui/base/win/open_file_name_win.h"
+#include "ui/base/win/shell.h"
 
 ShellHandler::ShellHandler() {}
 ShellHandler::~ShellHandler() {}
@@ -18,6 +19,8 @@ ShellHandler::~ShellHandler() {}
 bool ShellHandler::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ShellHandler, message)
+    IPC_MESSAGE_HANDLER(ChromeUtilityMsg_OpenItemViaShell,
+                        OnOpenItemViaShell)
     IPC_MESSAGE_HANDLER(ChromeUtilityMsg_GetOpenFileName,
                         OnGetOpenFileName)
     IPC_MESSAGE_UNHANDLED(handled = false)
@@ -25,6 +28,10 @@ bool ShellHandler::OnMessageReceived(const IPC::Message& message) {
   return handled;
 }
 
+void ShellHandler::OnOpenItemViaShell(const base::FilePath& full_path) {
+  ui::win::OpenItemViaShell(full_path);
+}
+
 void ShellHandler::OnGetOpenFileName(
     HWND owner,
     DWORD flags,