Remove legacy migration code that coupled history and bookmarks.

chrome/browser/history/history_backend.cc

Index: chrome/browser/history/history_backend.cc
diff --git a/chrome/browser/history/history_backend.cc b/chrome/browser/history/history_backend.cc
index c9407bc24af763c442f87693aae77b6dd2e7cc1e..48c039eaf8572a3e5e0dd02784362fb0c6bbb0a5 100644
--- a/chrome/browser/history/history_backend.cc
+++ b/chrome/browser/history/history_backend.cc
@@ -607,12 +607,10 @@ void HistoryBackend::InitImpl(const std::string& languages) {
   FilePath history_name = history_dir_.Append(chrome::kHistoryFilename);
   FilePath thumbnail_name = GetThumbnailFileName();
   FilePath archived_name = GetArchivedFileName();
-  FilePath tmp_bookmarks_file = history_dir_.Append(
-      chrome::kHistoryBookmarksFileName);
 
   // History database.
   db_.reset(new HistoryDatabase());
-  sql::InitStatus status = db_->Init(history_name, tmp_bookmarks_file);
+  sql::InitStatus status = db_->Init(history_name);
   switch (status) {
     case sql::INIT_OK:
       break;