Support removeRecursively and new copy/move behaviors for FileSystem API

base/file_util_proxy.h

Index: base/file_util_proxy.h
diff --git a/base/file_util_proxy.h b/base/file_util_proxy.h
index 081c11b31739a29995932bded93cdf57d693e18f..c9342ea4c5d317382e2d568c76738f9d3b121af8 100644
--- a/base/file_util_proxy.h
+++ b/base/file_util_proxy.h
@@ -89,6 +89,7 @@ class FileUtilProxy {
   // If destination file doesn't exist or destination's parent
   // doesn't exists.
   // If source dir exists but destination path is an existing file.
+  // If source file exists but destination path is an existing directory.
   // If source is a parent of destination.
   // If source doesn't exists.
   static bool Copy(scoped_refptr<MessageLoopProxy> message_loop_proxy,
@@ -105,9 +106,11 @@ class FileUtilProxy {
       bool recursive,
       StatusCallback* callback);
 
-  // Deletes a file or empty directory.
+  // Deletes a file or a directory.
+  // It is an error to delete a non-empty directory with recursive=false.
   static bool Delete(scoped_refptr<MessageLoopProxy> message_loop_proxy,
                      const FilePath& file_path,
+                     bool recursive,
                      StatusCallback* callback);
 
   // Moves a file or a directory from src_file_path to dest_file_path.