Fix ninja build for android.

content/public/android/java/content.xml

 <!-- 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="Content" default="dist" basedir=".">
   <description>
     building content java source code with ant
   </description>
   <!-- set global properties for this build -->
   <property environment="env"/>
   <property name="sdk.dir" location="${env.ANDROID_SDK_ROOT}"/>
   <property name="sdk.version" value="${env.ANDROID_SDK_VERSION}"/>
   <property name="src" location="."/>
   <property name="out.dir" location="${PRODUCT_DIR}/lib.java"/>
-  <property name="classes.dir" location="${out.dir}/java/${PACKAGE_NAME}"/>
+  <property name="classes.dir" location="${PRODUCT_DIR}/java/${PACKAGE_NAME}"/>
   <property name="jar.dir" location="${out.dir}"/>
 
   <condition property="location.base"
              value="${sdk.dir}"
              else="${sdk.dir}/platforms/android-${sdk.version}">
     <isset property="env.ANDROID_BUILD_TOP"/>
   </condition>
 
   <target name="init">
     <!-- Create the time stamp -->
@@ skipping 24 matching lines @@
     <!-- Put everything in ${classes.dir} into the chromium_content.jar file -->
     <jar jarfile="${jar.dir}/chromium_${PACKAGE_NAME}.jar" basedir="${classes.dir}"/>
   </target>
 
   <target name="clean" description="clean up" >
     <!-- Delete the generated content -->
     <delete dir="${classes.dir}"/>
     <delete file="${jar.dir}/chromium_${PACKAGE_NAME}.jar"/>
   </target>
 </project>