Use FilePaths in content::DropData to avoid redundant conversions.

content/public/common/drop_data.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/common/drop_data.h"
 
 namespace content {
 
-DropData::FileInfo::FileInfo() {
-}
-
-DropData::FileInfo::FileInfo(const base::string16& path,
-                             const base::string16& display_name)
-    : path(path),
-      display_name(display_name) {
-}
-
 DropData::DropData()
     : did_originate_from_renderer(false),
       referrer_policy(blink::WebReferrerPolicyDefault) {}
 
 DropData::~DropData() {
 }
 
 }  // namespace content