Use the most recently used download path when displaying a "save as" dialog....

chrome/browser/download/download_manager.h

Index: chrome/browser/download/download_manager.h
===================================================================
--- chrome/browser/download/download_manager.h	(revision 5442)
+++ chrome/browser/download/download_manager.h	(working copy)
@@ -366,6 +366,9 @@
 
   std::wstring download_path() { return *download_path_; }
 
+  // Clears the last download path, used to initialize "save as" dialogs.  
+  void ClearLastDownloadPath();
+
   // Registers this file extension for automatic opening upon download
   // completion if 'open' is true, or prevents the extension from automatic
   // opening if 'open' is false.
@@ -401,6 +404,10 @@
   // Shutdown the download manager.  This call is needed only after Init.
   void Shutdown();
 
+  // Determines whether the "save as" dialog should be displayed to the user
+  // when downloading a file.
+  bool ShouldDisplaySaveAsDialog(const DownloadCreateInfo* info);
+
   // Called on the download thread to check whether the suggested file path
   // exists.  We don't check if the file exists on the UI thread to avoid UI
   // stalls from interacting with the file system.