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 2e0009d94dc94f1ab22e235dc72b345ba717684b..f3531f513f9ea3603b88542e9061392885a672ee 100644
--- a/base/files/file_path.h
+++ b/base/files/file_path.h
@@ -285,6 +285,16 @@ class BASE_EXPORT FilePath {
   // platforms, an absolute path begins with a separator character.
   bool IsAbsolute() const;
 
+  // Returns an absolute version of a relative path. Returns an empty path on
+  // error. On POSIX, this function fails if the path does not exist.
+  FilePath AsAbsolute() const WARN_UNUSED_RESULT;
+
+  // 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.
+  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;