Add support for building apk in release

chrome/android/testshell/java/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 
 <!-- Copyright (c) 2012 The Chromium Authors. All rights reserved.
 
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file.
  -->
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.chromium.chrome.testshell">
 
     <permission android:name="org.chromium.chrome.testshell.permission.SANDBOX"
             android:protectionLevel="signature" />
 
     <application android:name="org.chromium.chrome.testshell.ChromiumTestShellApplication"
-            android:label="ChromiumTestShell"
-            android:debuggable="true">
+            android:label="ChromiumTestShell">
         <activity android:name="org.chromium.chrome.testshell.ChromiumTestShellActivity"
                   android:label="ChromiumTestShellActivity"
                   android:hardwareAccelerated="true">
               <intent-filter>
                   <action android:name="android.intent.action.MAIN" />
                   <category android:name="android.intent.category.LAUNCHER" />
               </intent-filter>
          </activity>
         <!-- The following service entries exist in order to allow us to
              start more than one sandboxed process. -->
@@ skipping 24 matching lines @@
                  android:process=":sandboxed_process5"
                  android:permission="org.chromium.content_shell.permission.SANDBOX"
                  android:exported="false" />
     </application>
 
     <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="16" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.WAKE_LOCK"/>
 </manifest>