Move Copy* into the base namespace.

chrome/installer/util/copy_tree_work_item.cc

Index: chrome/installer/util/copy_tree_work_item.cc
diff --git a/chrome/installer/util/copy_tree_work_item.cc b/chrome/installer/util/copy_tree_work_item.cc
index 118a217ad9bdfccf7ba9a9bc8175da3b031b6f86..ea14ea1647a1a68ac5fd43c067c0c2f373572231 100644
--- a/chrome/installer/util/copy_tree_work_item.cc
+++ b/chrome/installer/util/copy_tree_work_item.cc
@@ -53,7 +53,7 @@ bool CopyTreeWorkItem::Do() {
     // handle overwrite_option_ = NEW_NAME_IF_IN_USE case.
     if (alternative_path_.empty() ||
         file_util::PathExists(alternative_path_) ||
-        !file_util::CopyFile(source_path_, alternative_path_)) {
+        !base::CopyFile(source_path_, alternative_path_)) {
       LOG(ERROR) << "failed to copy " << source_path_.value()
                  << " to " << alternative_path_.value();
       return false;
@@ -90,7 +90,7 @@ bool CopyTreeWorkItem::Do() {
   }
 
   // In all cases that reach here, copy source to destination.
-  if (file_util::CopyDirectory(source_path_, dest_path_, true)) {
+  if (base::CopyDirectory(source_path_, dest_path_, true)) {
     copied_to_dest_path_ = true;
     VLOG(1) << "Copied source " << source_path_.value()
             << " to destination " << dest_path_.value();