Fix edit mistake, the point is to not include the SDK build.xml here

Change-Id: I3cfd5819be8075869906dac3b963b4d0b2cf2890

android/experimental/DocumentLoader/build.xml

@@ -80,6 +80,5 @@
          in order to avoid having your file be overridden by tools such as "android update project"
     -->
     <!-- version-tag: custom -->
-    <import file="${sdk.dir}/tools/ant/build.xml" />
     <import file="${android.library.reference.1}/no-resource-compress.xml" />
 </project>