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

chrome/browser/download/save_package.cc

Index: chrome/browser/download/save_package.cc
diff --git a/chrome/browser/download/save_package.cc b/chrome/browser/download/save_package.cc
index 81bdfcfdfe5a2dd5d252165196836d0e304fa532..cbc6ae9c3d0f4632fb94b22cd4ddd5a32212df03 100644
--- a/chrome/browser/download/save_package.cc
+++ b/chrome/browser/download/save_package.cc
@@ -11,6 +11,7 @@
 #include "base/i18n/file_util_icu.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
+#include "base/path_service.h"
 #include "base/stl_util-inl.h"
 #include "base/string_piece.h"
 #include "base/string_split.h"
@@ -1267,7 +1268,7 @@ void SavePackage::GetSaveInfo() {
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       NewRunnableMethod(this, &SavePackage::CreateDirectoryOnFileThread,
-          website_save_dir, download_save_dir, mime_type));
+                        website_save_dir, download_save_dir, mime_type));
 }
 
 void SavePackage::CreateDirectoryOnFileThread(
@@ -1275,15 +1276,26 @@ void SavePackage::CreateDirectoryOnFileThread(
     const FilePath& download_save_dir,
     const std::string& mime_type) {
   FilePath save_dir;
-  // If the default html/websites save folder doesn't exist...
-  if (!file_util::DirectoryExists(website_save_dir)) {
-    // If the default download dir doesn't exist, create it.
-    if (!file_util::DirectoryExists(download_save_dir))
-      file_util::CreateDirectory(download_save_dir);
+  if (file_util::DirectoryExists(website_save_dir)) {
+    // If the default html/websites save folder exists,
+    // then use the default html/websites save folder.
+    save_dir = website_save_dir;
+  } else if (file_util::DirectoryExists(download_save_dir)) {
+    // If the default html/websites save folder does not exist
+    // but the default download folder exists,
+    // then use the default download folder.
     save_dir = download_save_dir;
   } else {
-    // If it does exist, use the default save dir param.
-    save_dir = website_save_dir;
+    // If both the above folders do not exist,
+    // use the user's "Downloads" folder.
+    if (!PathService::Get(chrome::DIR_DEFAULT_DOWNLOADS, &save_dir)) {
+      // Create the |download_save_dir| folder if we cannot get
+      // DIR_DEFAULT_DOWNLOADS (This will be a rare case).
+      save_dir = download_save_dir;
+    }
+    // Make sure that the folder does exist.
+    if (!file_util::CreateDirectory(save_dir))
+      LOG(ERROR) << "Failed to create " << save_dir.value();
   }
 
   bool can_save_as_complete = CanSaveAsComplete(mime_type);