Move FileEnumerator to its own file, do some refactoring.

chrome/test/ui/ui_test.cc

Index: chrome/test/ui/ui_test.cc
diff --git a/chrome/test/ui/ui_test.cc b/chrome/test/ui/ui_test.cc
index 87c56794272f005e6c1649aa02915f943e135959..b4717156bfdeeeb5f5717b3018dbdc3b6f05e9e2 100644
--- a/chrome/test/ui/ui_test.cc
+++ b/chrome/test/ui/ui_test.cc
@@ -17,6 +17,7 @@
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_file_value_serializer.h"
@@ -447,11 +448,9 @@ int UITestBase::GetCrashCount() const {
   PathService::Get(chrome::DIR_CRASH_DUMPS, &crash_dump_path);
 
   int files_found = 0;
-  file_util::FileEnumerator en(crash_dump_path, false,
-                               file_util::FileEnumerator::FILES);
+  base::FileEnumerator en(crash_dump_path, false, base::FileEnumerator::FILES);
   while (!en.Next().empty()) {
-    file_util::FileEnumerator::FindInfo info;
-    if (file_util::FileEnumerator::GetLastModifiedTime(info) > test_start_time_)
+    if (en.GetInfo().GetLastModifiedTime() > test_start_time_)
       files_found++;
   }
 
@@ -460,7 +459,7 @@ int UITestBase::GetCrashCount() const {
   return files_found / 2;
 #else
   return files_found;
- #endif
+#endif
 }
 
 std::string UITestBase::CheckErrorsAndCrashes() const {