When the download folder does not exist, change the download folder to a user's "Downloads"

content/browser/tab_contents/tab_contents.cc

Index: content/browser/tab_contents/tab_contents.cc
diff --git a/content/browser/tab_contents/tab_contents.cc b/content/browser/tab_contents/tab_contents.cc
index d25617547e48687cb67ba6ff81e4bf13d482e9f0..37d6938d76d9e04005eb4fa8fff1d31eb54a21b6 100644
--- a/content/browser/tab_contents/tab_contents.cc
+++ b/content/browser/tab_contents/tab_contents.cc
@@ -17,6 +17,7 @@
 #include "chrome/browser/download/download_request_limiter.h"
 #include "chrome/browser/download/download_util.h"
 #include "content/browser/browser_context.h"
+#include "chrome/browser/download/save_package_file_picker.h"
 #include "content/browser/child_process_security_policy.h"
 #include "content/browser/content_browser_client.h"
 #include "content/browser/debugger/devtools_manager.h"
@@ -752,18 +753,29 @@ void TabContents::OnSavePage() {
   save_package_->GetSaveInfo();
 }
 
-// Used in automated testing to bypass prompting the user for file names.
-// Instead, the names and paths are hard coded rather than running them through
-// file name sanitation and extension / mime checking.
 bool TabContents::SavePage(const FilePath& main_file, const FilePath& dir_path,
                            SavePackage::SavePackageType save_type) {
   // Stop the page from navigating.
   Stop();
 
   save_package_ = new SavePackage(this, save_type, main_file, dir_path);
+  // Skips GetSaveInfo() and directly calls Init().
+  // We do not have to explicitly disable the select file dialog
+  // since we skip the process that can show the dialog.
   return save_package_->Init();
 }
 
+string16 TabContents::SavePageBasedOnDefaultPrefs() {
+  Stop();
+
+  save_package_ = new SavePackage(this);
+  // Disables the select file dialog.
+  SavePackageFilePicker::SetShouldPromptUser(false);
+  // This GetSaveInfo() calls save_package_->Init() in the background.
+  save_package_->GetSaveInfo();
+  return GetTitle();
+}
+
 void TabContents::OnSaveURL(const GURL& url) {
   DownloadManager* dlm = browser_context()->GetDownloadManager();
   dlm->DownloadUrl(url, GetURL(), "", this);