Update targetSdkVersion to 20 for remoting/

remoting/android/java/AndroidManifest.xml.jinja2

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
         package="{{ APK_PACKAGE_NAME }}">
     <uses-sdk android:minSdkVersion="14"
-            android:targetSdkVersion="14"/>
+            android:targetSdkVersion="20"/>
     <uses-permission android:name="android.permission.GET_ACCOUNTS"/>
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.MANAGE_ACCOUNTS"/>
     <uses-permission android:name="android.permission.USE_CREDENTIALS"/>
     <application android:label="@string/product_name_android"
             android:icon="@drawable/chromoting128"
             android:theme="@android:style/Theme.Holo">
         <activity android:name="org.chromium.chromoting.Chromoting"
                 android:configChanges="orientation|screenSize"
                 android:theme="@style/MainTheme"
@@ skipping 16 matching lines @@
             </intent-filter>
         </activity>
         <activity android:name="org.chromium.chromoting.Desktop"
                 android:configChanges="orientation|screenSize"
                 android:windowSoftInputMode="adjustResize"/>
         <activity android:name="org.chromium.chromoting.HelpActivity"
                 android:configChanges="orientation|screenSize"
                 android:uiOptions="splitActionBarWhenNarrow"/>
     </application>
 </manifest>