Move Rename functionality from DownloadFileManager to DownloadFileImple.

content/browser/download/download_file_manager.cc

Index: content/browser/download/download_file_manager.cc
diff --git a/content/browser/download/download_file_manager.cc b/content/browser/download/download_file_manager.cc
index 4fc4a86f991362d07e631f7e03a77434912e5dbe..7bebd92ef3970f5544759752c5048d4642fe2bef 100644
--- a/content/browser/download/download_file_manager.cc
+++ b/content/browser/download/download_file_manager.cc
@@ -195,42 +195,14 @@ void DownloadFileManager::RenameDownloadFile(
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   DownloadFile* download_file = GetDownloadFile(global_id);
   if (!download_file) {
-    BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
-                            base::Bind(callback, FilePath()));
-    return;
-  }
-
-  FilePath new_path(full_path);
-  if (!overwrite_existing_file) {
-    // Make the file unique if requested.
-    int uniquifier =
-        file_util::GetUniquePathNumber(new_path, FILE_PATH_LITERAL(""));
-    if (uniquifier > 0) {
-      new_path = new_path.InsertBeforeExtensionASCII(
-          StringPrintf(" (%d)", uniquifier));
-    }
-  }
-
-  // Do the actual rename
-  content::DownloadInterruptReason rename_error =
-      download_file->Rename(new_path);
-  if (content::DOWNLOAD_INTERRUPT_REASON_NONE != rename_error) {
-    DownloadManager* download_manager = download_file->GetDownloadManager();
-    DCHECK(download_manager);
-
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
-        base::Bind(&DownloadManager::OnDownloadInterrupted,
-                   download_manager,
-                   global_id.local(),
-                   download_file->BytesSoFar(),
-                   download_file->GetHashState(),
-                   rename_error));
-
-    new_path.clear();
+        base::Bind(callback, content::DOWNLOAD_INTERRUPT_REASON_FILE_FAILED,
+                   FilePath()));
+    return;
   }
-  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
-                          base::Bind(callback, new_path));
+
+  download_file->Rename(full_path, overwrite_existing_file, callback);
 }
 
 int DownloadFileManager::NumberOfActiveDownloads() const {