Android: remove ant environment dependencies.

net/android/java/net.xml

 <project name="net" default="dist" basedir=".">
   <description>
     Building net/ java source code with ant.
   </description>
   <!-- Set global properties for this build -->
-  <property environment="env"/>
-  <property name="sdk.dir" location="${env.ANDROID_SDK_ROOT}"/>
-  <!-- TODO(jrg): The apk-runner's version is hardcoded to SDK version 14. These
-    two should be unified. -->
-  <property name="sdk.version" value="${env.ANDROID_SDK_VERSION}"/>
   <property name="src" location="src"/>
   <property name="dist" location="dist"/>
   <property name="out.dir" location="${PRODUCT_DIR}/lib.java"/>
   <!-- TODO(jrg): establish a standard for the intermediate java
            directories.  Settle on a standard once ant/jar build files
            like this are androidified -->
   <property name="dest.dir" location="${PRODUCT_DIR}/java/net"/>
 
-  <!-- Set path depending on the type of repository. If ANDROID_BUILD_TOP is
-    set then build using the provided location. Otherwise, assume the build
-    is using the released SDK and set the path accordingly. -->
-  <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}"/>
     <mkdir dir="${dest.dir}"/>
   </target>
 
   <target name="compile" depends="init"
           description="compile the source " >
     <javac srcdir="${src}" destdir="${dest.dir}" debug="true" includeantruntime="false">
       <classpath>
-        <path location="${location.base}/android.jar"/>
+        <path location="${ANDROID_SDK}/android.jar"/>
         <path location="${out.dir}/chromium_base.jar"/>
       </classpath>
     </javac>
   </target>
 
   <target name="dist" depends="compile"
           description="generate the distribution" >
     <!-- Create the distribution directory -->
     <mkdir dir="${dist}/lib"/>
 
     <jar jarfile="${out.dir}/chromium_net.jar" basedir="${dest.dir}"/>
   </target>
 
   <target name="clean"
           description="clean up" >
     <delete dir="${dest.dir}"/>
     <delete dir="${dist}"/>
   </target>
 </project>