Move FileEnumerator to its own file, do some refactoring.

chrome/test/reliability/automated_ui_tests.cc

Index: chrome/test/reliability/automated_ui_tests.cc
diff --git a/chrome/test/reliability/automated_ui_tests.cc b/chrome/test/reliability/automated_ui_tests.cc
index a44c2746647bbe2076bcb6d5d9d7ef523652ad29..8e11dd72a8e849816a04f31ad3fbecf97e78bb23 100644
--- a/chrome/test/reliability/automated_ui_tests.cc
+++ b/chrome/test/reliability/automated_ui_tests.cc
@@ -10,6 +10,7 @@
 #include "base/environment.h"
 #include "base/file_util.h"
 #include "base/file_version_info.h"
+#include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/i18n/time_formatting.h"
 #include "base/logging.h"
@@ -771,9 +772,9 @@ base::FilePath AutomatedUITest::GetMostRecentCrashDump() {
 
   bool first_file = true;
 
-  file_util::FileEnumerator enumerator(crash_dump_path,
-                                       false,  // not recursive
-                                       file_util::FileEnumerator::FILES);
+  base::FileEnumerator enumerator(crash_dump_path,
+                                  false,  // not recursive
+                                  base::FileEnumerator::FILES);
   for (base::FilePath path = enumerator.Next(); !path.value().empty();
        path = enumerator.Next()) {
     base::PlatformFileInfo file_info;