Move file_util::Delete to the base namespace

chrome/installer/util/delete_tree_work_item.cc

Index: chrome/installer/util/delete_tree_work_item.cc
diff --git a/chrome/installer/util/delete_tree_work_item.cc b/chrome/installer/util/delete_tree_work_item.cc
index 0299a83f9b919d6cad885a5e2bbf28d728ed7b47..4aaf151aefe8b2a9727986b85326273ebebc420c 100644
--- a/chrome/installer/util/delete_tree_work_item.cc
+++ b/chrome/installer/util/delete_tree_work_item.cc
@@ -91,7 +91,7 @@ bool DeleteTreeWorkItem::Do() {
     // We can safely delete the key files now.
     for (ptrdiff_t i = 0; !abort && i != num_key_files_; ++i) {
       base::FilePath& key_file = key_paths_[i];
-      if (!file_util::Delete(key_file, true)) {
+      if (!base::Delete(key_file, true)) {
         // This should not really be possible because of the above.
         PLOG(DFATAL) << "Unexpectedly could not delete " << key_file.value();
         abort = true;
@@ -126,7 +126,7 @@ bool DeleteTreeWorkItem::Do() {
         }
       }
     }
-    if (!file_util::Delete(root_path_, true)) {
+    if (!base::Delete(root_path_, true)) {
       LOG(ERROR) << "can not delete " << root_path_.value();
       return ignore_failure_;
     }