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

chrome/browser/download/save_file_manager.cc

Index: chrome/browser/download/save_file_manager.cc
diff --git a/chrome/browser/download/save_file_manager.cc b/chrome/browser/download/save_file_manager.cc
index d5df502c2947f0e29db55bdd90a2a7ef7204ad0a..c4c784e84dee35aedc2eced42aa28903b31295e6 100644
--- a/chrome/browser/download/save_file_manager.cc
+++ b/chrome/browser/download/save_file_manager.cc
@@ -12,9 +12,12 @@
 #include "base/string_util.h"
 #include "base/task.h"
 #include "base/threading/thread.h"
+#include "chrome/browser/download/download_manager.h"
+#include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/download/save_file.h"
 #include "chrome/browser/download/save_package.h"
 #include "chrome/browser/platform_util.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/tab_contents/tab_util.h"
 #include "chrome/browser/ui/download/download_tab_helper.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
@@ -125,6 +128,12 @@ void SaveFileManager::SaveURL(
     SavePackage* save_package) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
+  TabContents* contents =
+      tab_util::GetTabContentsByID(render_process_host_id, render_view_id);
+  DownloadPrefs* download_prefs =
+      contents->profile()->GetDownloadManager()->download_prefs();
+  FilePath default_download_dir = download_prefs->GetDefaultDownloadDirectory();
+
   // Register a saving job.
   RegisterStartingRequest(url, save_package);
   if (save_source == SaveFileCreateInfo::SAVE_FILE_FROM_NET) {
@@ -138,6 +147,7 @@ void SaveFileManager::SaveURL(
                           referrer,
                           render_process_host_id,
                           render_view_id,
+                          default_download_dir,
                           &context));
   } else {
     // We manually start the save job.
@@ -225,7 +235,8 @@ void SaveFileManager::StartSave(SaveFileCreateInfo* info) {
   SaveFile* save_file = new SaveFile(info);
 
   // TODO(phajdan.jr): We should check the return value and handle errors here.
-  save_file->Initialize(false);  // No need to calculate hash.
+  // No need to calculate hash.
+  save_file->Initialize(false, info->default_download_dir);
 
   DCHECK(!LookupSaveFile(info->save_id));
   save_file_map_[info->save_id] = save_file;
@@ -362,12 +373,14 @@ void SaveFileManager::OnSaveURL(
     const GURL& referrer,
     int render_process_host_id,
     int render_view_id,
+    const FilePath& default_download_dir,
     const content::ResourceContext* context) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   resource_dispatcher_host_->BeginSaveFile(url,
                                            referrer,
                                            render_process_host_id,
                                            render_view_id,
+                                           default_download_dir,
                                            *context);
 }