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

chrome/browser/download/base_file.cc

Index: chrome/browser/download/base_file.cc
diff --git a/chrome/browser/download/base_file.cc b/chrome/browser/download/base_file.cc
index e52f08ad5b0a53e8de5e2d41c4abe00956ca853c..ea0ccf941110be7cb56bd0b6785fa496b3964445 100644
--- a/chrome/browser/download/base_file.cc
+++ b/chrome/browser/download/base_file.cc
@@ -46,7 +46,7 @@ BaseFile::~BaseFile() {
     Cancel();  // Will delete the file.
 }
 
-bool BaseFile::Initialize(bool calculate_hash) {
+bool BaseFile::Initialize(bool calculate_hash, const FilePath& save_path) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   DCHECK(!detached_);
 
@@ -55,10 +55,10 @@ bool BaseFile::Initialize(bool calculate_hash) {
   if (calculate_hash_)
     secure_hash_.reset(crypto::SecureHash::Create(crypto::SecureHash::SHA256));
 
-  if (!full_path_.empty() ||
-      download_util::CreateTemporaryFileForDownload(&full_path_))
-    return Open();
-  return false;
+  if (full_path_.empty() &&
+      !file_util::CreateTemporaryFileInDir(save_path, &full_path_))
+    return false;
+  return Open();
 }
 
 bool BaseFile::AppendDataToFile(const char* data, size_t data_len) {