General cleanup on AppRTC Android Demo codebase

webrtc/examples/androidapp/res/layout/fragment_hud.xml

 <?xml version="1.0" encoding="utf-8"?>
 
 <RelativeLayout
-        xmlns:android="http://schemas.android.com/apk/res/android"
-        xmlns:tools="http://schemas.android.com/tools"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent">
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
 
     <ImageButton
         android:id="@+id/button_toggle_debug"
         android:background="@android:drawable/ic_menu_info_details"
         android:contentDescription="@string/toggle_debug"
         android:layout_alignParentBottom="true"
         android:layout_alignParentStart="true"
         android:layout_width="48dp"
         android:layout_height="48dp"/>
 
     <TextView
         android:id="@+id/encoder_stat_call"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentEnd="true"
         android:textStyle="bold"
         android:textColor="#C000FF00"
-        android:textSize="12dp"
+        android:textSize="12sp"
         android:layout_margin="8dp"/>
 
     <TableLayout
            android:id="@+id/hudview_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
 
            <TableRow>
               <TextView
                  android:id="@+id/hud_stat_bwe"
@@ skipping 30 matching lines @@
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:padding="2dip"
                  android:alpha="0.4"
                  android:background="@android:color/white"
                  android:textColor="@android:color/black" />
             </TableRow>
     </TableLayout>
 
 </RelativeLayout>