Android: remove ant environment dependencies.

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="src"/>
   <property name="out.dir" location="${PRODUCT_DIR}/lib.java"/>
   <property name="classes.dir" location="${PRODUCT_DIR}/java/${PACKAGE_NAME}"/>
   <property name="jar.dir" location="${out.dir}"/>
 
-  <condition property="location.base"
-             value="${sdk.dir}"
-             else="${sdk.dir}/platforms/android-${sdk.version}">
-    <isset property="env.ANDROID_BUILD_TOP"/>
-  </condition>
-
   <target name="init">
     <!-- Create the time stamp -->
     <tstamp/>
     <!-- Create the build directory structure used by compile -->
     <mkdir dir="${out.dir}"/>
   </target>
 
   <target name="compile" depends="init"
           description="compile the source " >
     <!-- Create the classes output directory -->
     <mkdir dir="${classes.dir}"/>
 
     <!-- Compile the java code from ${src} into ${classes.dir} -->
     <!-- Gyp target should have compiled aidl files into java source files in
          lib.jar (see content.gyp:common_aidl). -->
     <javac srcdir="${src}:${out.dir}" destdir="${classes.dir}" debug="true" includeantruntime="false">
       <classpath>
-        <pathelement path="${location.base}/android.jar" />
+        <pathelement path="${ANDROID_SDK}/android.jar" />
         <pathelement path="${jar.dir}/chromium_base.jar" />
         <pathelement path="${jar.dir}/chromium_net.jar" />
       </classpath>
     </javac>
   </target>
 
   <target name="dist" depends="compile"
           description="generate the distribution" >
     <!-- Create the distribution directory -->
     <mkdir dir="${jar.dir}"/>
 
     <!-- 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>