Simplify main activity layout file

res/layout/activity_main.xml

@@ -21,12 +21,7 @@
 
             <include layout="@layout/toolbar" />
 
-            <FrameLayout
-                android:id="@+id/content_frame"
-                android:layout_width="match_parent"
-                android:layout_height="0dp"
-                android:layout_weight="1"
-                android:background="@color/primary_color" />
+            <include layout="@layout/browser_content" />
 
             <include layout="@layout/search_interface" />
         </LinearLayout>

res/layout/browser_content.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/content_frame"
+    android:layout_width="match_parent"
+    android:layout_height="0dp"
+    android:layout_weight="1"
+    android:background="@color/primary_color" />