Introduce content::PageState (again).

content/public/common/page_state_ios.cc

+// Copyright (c) 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/page_state.h"
+
+#include "base/files/file_path.h"
+#include "base/logging.h"
+
+namespace content {
+
+// static
+PageState PageState::CreateFromURL(const GURL& url) {
+  NOTIMPLEMENTED();
+  return PageState();
+}
+
+// static
+PageState PageState::CreateForTesting(
+    const GURL& url,
+    bool body_contains_password_data,
+    const char* optional_body_data,
+    const base::FilePath* optional_body_file_path) {
+  NOTIMPLEMENTED();
+  return PageState();
+}
+
+std::vector<base::FilePath> PageState::GetReferencedFiles() const {
+  NOTIMPLEMENTED();
+  return std::vector<base::FilePath>();
+}
+
+PageState PageState::RemovePasswordData() const {
+  NOTIMPLEMENTED();
+  return *this;
+}
+
+PageState PageState::RemoveScrollOffset() const {
+  NOTIMPLEMENTED();
+  return *this;
+}
+
+}  // namespace content