Remove hardcoded chromium_*.jar paths

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>
@@ skipping 31 matching lines @@
         <isset property="PRODUCT_DIR"/>
       </not>
     </condition>
   </fail>
 
   <property name="out.dir" location="${PRODUCT_DIR}/replaceme_apk"/>
 
   <property name="resource.absolute.dir" value="res"/>
   <property name="gen.absolute.dir" value="${out.dir}/gen"/>
 
-  <condition property="external.jars.dir"
-             value="${out.dir}/java/libs"
-             else="">
-      <available file="${out.dir}/java/libs" type="dir"/>
-  </condition>
   <path id="out.dex.jar.input.ref">
-      <fileset dir="${external.jars.dir}" includes="*.jar"/>
+      <filelist files="${INPUT_JARS_PATHS}"/>
   </path>
   <condition property="java.compilerargs"
              value="-classpath ${toString:out.dex.jar.input.ref}">
     <not>
-      <equals arg1="${external.jars.dir}" arg2=""/>
+      <equals arg1="${toString:out.dex.jar.input.ref}" arg2=""/>
     </not>
   </condition>
   <property name="native.libs.absolute.dir" location="${out.dir}/libs" />
 
   <!-- Copy the below manifest file to a new directory because the project
        base directory and output directory are the same and manifest merge
        task takes the same file as source and target when doing copying.
        Otherwise it'll generate an empty manifest file. -->
   <copy file="AndroidManifest.xml" todir="${out.dir}/manifest"/>
   <property name="manifest.abs.file" location="${out.dir}/manifest/AndroidManifest.xml"/>
@@ skipping 10 matching lines @@
           <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>