Fix ant build of content shell for updated Android SDK tools.

content/shell/android/java/content_shell_apk.xml

Index: content/shell/android/java/content_shell_apk.xml
diff --git a/content/shell/android/java/content_shell_apk.xml b/content/shell/android/java/content_shell_apk.xml
index 986979a5aaa6d6862a2c437c2e4d1e38892abd00..cbdeaccfeafb5d94e4a1e0cd1293ec6db9608251 100644
--- a/content/shell/android/java/content_shell_apk.xml
+++ b/content/shell/android/java/content_shell_apk.xml
@@ -19,19 +19,19 @@
   <property name="out.dir" location="${PRODUCT_DIR}/content_shell"/>
   <property name="resource.absolute.dir" value="../res"/>
   <property name="gen.absolute.dir" value="${out.dir}/gen"/>
-  <property name="jar.libs.dir" value="${out.dir}/java/libs"/>
   <path id="native.libs.gdbserver">
     <fileset file="${toolchain.dir}/../../gdbserver"/>
   </path>
   <property name="native.libs.absolute.dir" location="${out.dir}/libs" />
   <property name="asset.absolute.dir" location="${out.dir}/assets" />
-  <!-- If your app crashes when referencing java from a different .jar
-       (e.g.  java.lang.NoClassDefFoundError:
-       org.chromium.content.common.CommandLine), And if
-       chromium_content.jar is in fact in your java/libs directory (as
-       placed by a gyp 'cp'), the following line will make sure it
-       gets added to the classes.dex file. -->
-  <property name="out.classes.absolute.dir" location="${jar.libs.dir}" /> 
+
+  <path id="out.dex.jar.input.ref">
+    <fileset file="${out.dir}/java/libs/chromium_content.jar"/>
+    <fileset file="${out.dir}/java/libs/chromium_net.jar"/>
+    <fileset file="${out.dir}/java/libs/chromium_base.jar"/>
+    <fileset file="${out.dir}/java/libs/chromium_media.jar"/>
+  </path>
+  <property name="java.compilerargs" value="-classpath ${toString:out.dex.jar.input.ref}"/>
 
   <!-- We expect PRODUCT_DIR to be set like the gyp var
        (e.g. $ROOT/out/Debug) -->