Move FileEnumerator to its own file, do some refactoring.

content/browser/indexed_db/indexed_db_context_impl.cc

Index: content/browser/indexed_db/indexed_db_context_impl.cc
diff --git a/content/browser/indexed_db/indexed_db_context_impl.cc b/content/browser/indexed_db/indexed_db_context_impl.cc
index b95be28fdb65f1a4988c578bf3688ee4713358ff..a0b945bea7e728db8c29e765887a38177be3fdcb 100644
--- a/content/browser/indexed_db/indexed_db_context_impl.cc
+++ b/content/browser/indexed_db/indexed_db_context_impl.cc
@@ -9,6 +9,7 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
 #include "base/string_util.h"
@@ -46,8 +47,8 @@ void GetAllOriginsAndPaths(
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::WEBKIT_DEPRECATED));
   if (indexeddb_path.empty())
     return;
-  file_util::FileEnumerator file_enumerator(indexeddb_path,
-      false, file_util::FileEnumerator::DIRECTORIES);
+  base::FileEnumerator file_enumerator(indexeddb_path,
+      false, base::FileEnumerator::DIRECTORIES);
   for (base::FilePath file_path = file_enumerator.Next(); !file_path.empty();
        file_path = file_enumerator.Next()) {
     if (file_path.Extension() == IndexedDBContextImpl::kIndexedDBExtension) {