Fix warnings in WebM demo app

demo_misc/webm_sw_decoder/src/main/AndroidManifest.xml

@@ -15,6 +15,7 @@
 -->
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     package="com.google.android.exoplayer.demo.webm"
     android:versionCode="1"
     android:versionName="1.0"
@@ -28,6 +29,7 @@
   <uses-sdk android:minSdkVersion="9" android:targetSdkVersion="22"/>
 
   <application
+      tools:ignore="UnusedAttribute"
       android:label="@string/app_name"
       android:largeHeap="true"
       android:allowBackup="false"

demo_misc/webm_sw_decoder/src/main/res/values-v11/styles.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2014 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.
+-->
+
+<resources xmlns:android="http://schemas.android.com/apk/res/android">
+
+  <style name="RootTheme" parent="android:Theme.Holo"/>
+
+</resources>

demo_misc/webm_sw_decoder/src/main/res/values/styles.xml

@@ -16,7 +16,7 @@
 
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
 
-  <style name="RootTheme" parent="android:Theme.Holo"/>
+  <style name="RootTheme" parent="android:Theme"/>
 
   <style name="PlayerTheme" parent="@style/RootTheme">
     <item name="android:windowNoTitle">true</item>