Always show file extensions in the shelf.

base/file_util.h

Index: base/file_util.h
===================================================================
--- base/file_util.h	(revision 4245)
+++ base/file_util.h	(working copy)
@@ -67,6 +67,9 @@
 // the file has no extension.
 std::wstring GetFileExtensionFromPath(const std::wstring& path);
 
+// Returns 'jojo' for path "C:\pics\jojo.jpg".
+std::wstring GetFilenameWithoutExtensionFromPath(const std::wstring& path);
+
 // Returns the directory component of a path, without the trailing
 // path separator, or an empty string on error. The function does not
 // check for the existence of the path, so if it is passed a directory