Move path functions from file_util to FilePath object.

base/files/file_path.h

Index: base/files/file_path.h
diff --git a/base/files/file_path.h b/base/files/file_path.h
index cf3dc620e3760def439a37b21668236e85d52c83..d66d631b7daa5d2191006448f66c3001c218aa4c 100644
--- a/base/files/file_path.h
+++ b/base/files/file_path.h
@@ -285,6 +285,13 @@ class BASE_EXPORT FilePath {
   // platforms, an absolute path begins with a separator character.
   bool IsAbsolute() const;
 
+  // Returns true if the patch ends with a path separator character.
+  bool EndsWithSeparator() const WARN_UNUSED_RESULT;
+
+  // Returns a copy of this FilePath that ends with a trailing separator. If
+  // the input path is empty, an empty FilePath will be returned.
+  FilePath AsEndingWithSeparator() const WARN_UNUSED_RESULT;
+
   // Returns a copy of this FilePath that does not end with a trailing
   // separator.
   FilePath StripTrailingSeparators() const WARN_UNUSED_RESULT;