Move files instead of copying them.

chrome/installer/util/work_item.h

Index: chrome/installer/util/work_item.h
diff --git a/chrome/installer/util/work_item.h b/chrome/installer/util/work_item.h
index 08942a1b8ca8e65a42d0890ccefb0d3df6ef45fb..f23e1814dc7068a4b485caa7cebaaccf9e291a5f 100644
--- a/chrome/installer/util/work_item.h
+++ b/chrome/installer/util/work_item.h
@@ -17,6 +17,7 @@ class CreateDirWorkItem;
 class CreateRegKeyWorkItem;
 class DeleteTreeWorkItem;
 class DeleteRegValueWorkItem;
+class MoveTreeWorkItem;
 class SetRegValueWorkItem;
 class WorkItemList;
 
@@ -65,6 +66,11 @@ class WorkItem {
   static DeleteTreeWorkItem* CreateDeleteTreeWorkItem(std::wstring root_path,
                                                       std::wstring key_path);
 
+  // Create a MoveTreeWorkItem that recursively moves a file system hierarchy
+  // from source path to destination path.
+  static MoveTreeWorkItem* CreateMoveTreeWorkItem(std::wstring source_path,
+      std::wstring dest_path, std::wstring temp_dir);
+
   // Create a SetRegValueWorkItem that sets a registry value with REG_SZ type
   // at the key with specified path.
   static SetRegValueWorkItem* CreateSetRegValueWorkItem(