[ios] Moved WebLoadParams inside NavigationManager.

ios/web/navigation/web_load_params.mm

-// 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 "ios/web/navigation/web_load_params.h"
-
-namespace web {
-
-WebLoadParams::WebLoadParams(const GURL& url)
-    : url(url),
-      transition_type(ui::PAGE_TRANSITION_LINK),
-      is_renderer_initiated(false),
-      post_data(NULL) {
-}
-
-WebLoadParams::~WebLoadParams() {}
-
-WebLoadParams::WebLoadParams(const WebLoadParams& other)
-    : url(other.url),
-      referrer(other.referrer),
-      transition_type(other.transition_type),
-      is_renderer_initiated(other.is_renderer_initiated),
-      extra_headers([other.extra_headers copy]),
-      post_data([other.post_data copy]) {
-}
-
-WebLoadParams& WebLoadParams::operator=(
-    const WebLoadParams& other) {
-  url = other.url;
-  referrer = other.referrer;
-  is_renderer_initiated = other.is_renderer_initiated;
-  transition_type = other.transition_type;
-  extra_headers.reset([other.extra_headers copy]);
-  post_data.reset([other.post_data copy]);
-
-  return *this;
-}
-
-}  // namespace web