Add FrameNavigationEntry class.

content/browser/frame_host/frame_navigation_entry.cc

Index: content/browser/frame_host/frame_navigation_entry.cc
diff --git a/content/browser/frame_host/frame_navigation_entry.cc b/content/browser/frame_host/frame_navigation_entry.cc
new file mode 100644
index 0000000000000000000000000000000000000000..df1a2f81d399d96e4c05febf2f7f1fad4d1a0440
--- /dev/null
+++ b/content/browser/frame_host/frame_navigation_entry.cc
@@ -0,0 +1,23 @@
+// Copyright 2015 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/browser/frame_host/frame_navigation_entry.h"
+
+namespace content {
+
+FrameNavigationEntry::FrameNavigationEntry() {
+}
+
+FrameNavigationEntry::FrameNavigationEntry(SiteInstanceImpl* site_instance,
+                                           const GURL& url,
+                                           const Referrer& referrer)
+    : site_instance_(site_instance),
+      url_(url),
+      referrer_(referrer) {
+}
+
+FrameNavigationEntry::~FrameNavigationEntry() {
+}
+
+}  // namespace content