Move Touch to base namespace, remove SetLastModifiedTime.

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

Index: chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
diff --git a/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc b/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
index f9ccdbfc4c4b4f6c5f77cefaa982db1ad83136ed..4ea816799086eb0edb5701d9bbd1465b0190458e 100644
--- a/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
+++ b/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
@@ -236,7 +236,8 @@ class LocalTestVolume {
   // TestEntryInfo. Returns true on success.
   bool UpdateModifiedTime(const TestEntryInfo& entry) {
     const base::FilePath path = local_path_.AppendASCII(entry.target_path);
-    if (!file_util::SetLastModifiedTime(path, entry.last_modified_time))
+    if (!base::TouchFile(path, entry.last_modified_time,
+                         entry.last_modified_time))
       return false;
 
     // Update the modified time of parent directories because it may be also