Fix the gdb path for NDK-r8b.

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 14 matching lines @@
     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}"/>
 
   <path id="native.libs.gdbserver">
-    <fileset file="${toolchain.dir}/../../gdbserver"/>
+    <fileset file="${android.gdbserver}"/>
   </path>
 
   <!-- We expect PRODUCT_DIR to be set like the gyp var
        (e.g. $ROOT/out/Debug) -->
   <fail message="PRODUCT_DIR env var not set?">
     <condition>
       <not>
         <isset property="PRODUCT_DIR"/>
       </not>
     </condition>
@@ skipping 38 matching lines @@
         <copy todir="${out.dir}/libs/${target.abi}">
           <path refid="native.libs.gdbserver"/>
         </copy>
       </then>
     </if>
   </target>
 
   <import file="${sdk.dir}/tools/ant/build.xml" />
 
 </project>