Convert download manager to FilePath.

chrome/common/win_util.cc

Index: chrome/common/win_util.cc
===================================================================
--- chrome/common/win_util.cc	(revision 7599)
+++ chrome/common/win_util.cc	(working copy)
@@ -223,10 +223,10 @@
 
 // Open an item via a shell execute command. Error code checking and casting
 // explanation: http://msdn2.microsoft.com/en-us/library/ms647732.aspx
-bool OpenItemViaShell(const std::wstring& full_path, bool ask_for_app) {
+bool OpenItemViaShell(const FilePath& full_path, bool ask_for_app) {
   HINSTANCE h = ::ShellExecuteW(
-      NULL, NULL, full_path.c_str(), NULL,
-      file_util::GetDirectoryFromPath(full_path).c_str(), SW_SHOWNORMAL);
+      NULL, NULL, full_path.value().c_str(), NULL,
+      full_path.DirName().value().c_str(), SW_SHOWNORMAL);
 
   LONG_PTR error = reinterpret_cast<LONG_PTR>(h);
   if (error > 32)