Move FileEnumerator to its own file, do some refactoring.

webkit/plugins/npapi/plugin_list_posix.cc

Index: webkit/plugins/npapi/plugin_list_posix.cc
diff --git a/webkit/plugins/npapi/plugin_list_posix.cc b/webkit/plugins/npapi/plugin_list_posix.cc
index 6d3de1422c008da8cfb48bcba805e6c9bbf5536d..b65bab229fb0a96b0e1ad807b0a559e9a6c4efdc 100644
--- a/webkit/plugins/npapi/plugin_list_posix.cc
+++ b/webkit/plugins/npapi/plugin_list_posix.cc
@@ -18,6 +18,7 @@
 
 #include "base/cpu.h"
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/native_library.h"
 #include "base/path_service.h"
 #include "base/posix/eintr_wrapper.h"
@@ -493,9 +494,9 @@ void PluginList::GetPluginsInDir(
   // Construct and stat a list of all filenames under consideration, for
   // later sorting by mtime.
   FileTimeList files;
-  file_util::FileEnumerator enumerator(dir_path,
-                                       false,  // not recursive
-                                       file_util::FileEnumerator::FILES);
+  base::FileEnumerator enumerator(dir_path,
+                                  false,  // not recursive
+                                  base::FileEnumerator::FILES);
   for (base::FilePath path = enumerator.Next(); !path.value().empty();
        path = enumerator.Next()) {
     // Skip over Mozilla .xpt files.