Use checked in keystore to sign debug apks

testing/android/native_test_apk.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.
 -->
 
 <project name="replaceme" default="debug" basedir=".">
 
   <description>
     Building native test runner ChromeNativeTests_replaceme.apk
   </description>
 
   <!--
     TODO(beverloo): Remove this property when all gyp files (also those in
     WebKit) define the CHROMIUM_SRC property. This works because properties
     in ant files are immutable.
   -->
   <property name="CHROMIUM_SRC" value="${PRODUCT_DIR}/../.." />
 
   <import file="${CHROMIUM_SRC}/build/android/ant/common.xml"/>
-  <import file="${CHROMIUM_SRC}/build/android/ant/sdk-targets.xml"/>
 
   <!--
     TODO(yfriedman): Remove the need to specify this. We should generate the packages in a way such
     that it's not required.
   -->
   <property name="source.absolute.dir" value="java/src"/>
   <path id="javac.custom.classpath">
     <pathelement location="${ANDROID_SDK}/android.jar" />
   </path>
   <property name="target.abi" value="${APP_ABI}"/>
@@ skipping 48 matching lines @@
       </condition>
       <then>
         <echo message="Copying gdbserver to the apk to enable native debugging"/>
         <copy todir="${out.dir}/libs/${target.abi}">
           <path refid="native.libs.gdbserver"/>
         </copy>
       </then>
     </if>
   </target>
 
+  <import file="${CHROMIUM_SRC}/build/android/ant/sdk-targets.xml"/>
   <import file="${sdk.dir}/tools/ant/build.xml" />
 
 </project>