Abstract content::SessionStorageNamespace from core TabRestore code

components/sessions/content/content_tab_client_data.cc

Index: components/sessions/content/content_tab_client_data.cc
diff --git a/components/sessions/content/content_tab_client_data.cc b/components/sessions/content/content_tab_client_data.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1de992e97fc5a9ee24f47263030adc28533eb55f
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+++ b/components/sessions/content/content_tab_client_data.cc
@@ -0,0 +1,20 @@
+// 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 "components/sessions/content/content_tab_client_data.h"
+
+#include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/web_contents.h"
+
+namespace sessions {
+
+ContentTabClientData::ContentTabClientData(content::WebContents* web_contents)
+    :  // TODO(ajwong): This does not correctly handle storage for isolated
+       // apps.
+      session_storage_namespace_(web_contents->GetController()
+                                     .GetDefaultSessionStorageNamespace()) {}
+
+ContentTabClientData::~ContentTabClientData() {}
+
+}  // namespace sessions