Reduce verbosity of Android builds.

build/android/ant/chromium-jars.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="chromium-jars" default="dist">
   <!--
     Common ant build file for for chromium_*.jars.
     For creating a new chromium_*.jar :
     1. Use build/java.gypi action.
@@ skipping 50 matching lines @@
   </target>
 
   <target name="compile" depends="init" description="Compiles source.">
     <fail message="Error: javac.custom.classpath is not set. Please set it to
         classpath for javac.">
       <condition>
         <not><isreference refid="javac.custom.classpath"/></not>
       </condition>
     </fail>
 
-    <echo>
-      Compiling ${javac.srcdir}, classpath: ${toString:javac.custom.classpath}
-      ${javac_includes_message}
-    </echo>
-
     <javac
       srcdir="${javac.srcdir}"
       destdir="${dest.dir}"
       classpathref="javac.custom.classpath"
       debug="true"
       includeantruntime="false"
       includes="${JAVAC_INCLUDES}"
     />
   </target>
 
@@ skipping 13 matching lines @@
          be rebuilt in future builds.
     -->
     <touch file="${lib.java.dir}/chromium_${PACKAGE_NAME}.jar"/>
   </target>
 
   <target name="clean" description="clean up">
     <!-- Delete the appropriate directory trees -->
     <delete dir="${dest.dir}"/>
   </target>
 </project>