Fix crash when dynamic_homepage flag is off.

This partially rolls back ag/5650901. We should revert this change when
dynamic_homepage flag is permanently on.

Change-Id: I5e340421d04bc20c77dd30395fd8522693807954
Fixes: 118444000
Test: manual

res/layout/settings_main_dashboard.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2018 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<!-- TODO(118444000): Remove this -->
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <include layout="@layout/search_bar" />
+
+    <FrameLayout
+        android:id="@+id/main_content"
+        android:layout_height="match_parent"
+        android:layout_width="match_parent" />
+</LinearLayout>