Pull shell window stuff out of ExtensionHost and put in ShellWindow

chrome/browser/extensions/base_extension_host.cc

+// Copyright (c) 2012 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 "chrome/browser/extensions/base_extension_host.h"
+
+#include "chrome/browser/ui/browser.h"
+
+BaseExtensionHost::~BaseExtensionHost() {}
+
+void BaseExtensionHost::CreateView(Browser* browser) {
+#if defined(TOOLKIT_VIEWS)
+  view_.reset(new ExtensionView(this, browser));
+  // We own |view_|, so don't auto delete when it's removed from the view
+  // hierarchy.
+  view_->set_parent_owned(false);
+#elif defined(OS_MACOSX)
+  view_.reset(new ExtensionViewMac(this, browser));
+  view_->Init();
+#elif defined(TOOLKIT_GTK)
+  view_.reset(new ExtensionViewGtk(this, browser));
+  view_->Init();
+#else
+  // TODO(port)
+  NOTREACHED();
+#endif
+}