Move WebDropData to content::DropData and split off conversion function.

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()
+    : referrer_policy(WebKit::WebReferrerPolicyDefault) {
+}
+
+DropData::~DropData() {
+}
+
+}  // namespace content