Revert of Upgrade to new Android SDK.

tools/android/eclipse/.classpath

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- {% block header_message %}
 
 Eclipse classpath. See instructions at
 https://www.chromium.org/developers/android-eclipse-dev for setting up Eclipse
 for Chrome Android development.
 
 Obsolete entries can be found using:
 
   for f in $(grep -oP '(?<= path=")[^"]*' tools/android/eclipse/.classpath); do
@@ skipping 192 matching lines @@
     <classpathentry kind="src" path="out/Debug/gen/templates/load_states_list"/>
     <classpathentry kind="src" path="out/Debug/gen/templates/net_errors_java"/>
     <classpathentry kind="src" path="out/Debug/gen/templates/resource_id_java"/>
     <classpathentry kind="src" path="out/Debug/java_mojo/device_battery_mojo_bindings/src"/>
     <classpathentry kind="src" path="out/Debug/java_mojo/mojo_public_test_interfaces_mojom/src"/>
     <classpathentry kind="src" path="out/Debug/java_proto/cacheinvalidation_proto_java/src"/>
     <classpathentry kind="src" path="out/Debug/java_proto/document_tab_model_info_proto_java/src"/>
     <classpathentry kind="src" path="out/Debug/java_proto/test_support_sync_proto_java/src"/>
     <classpathentry kind="src" path="out/Debug/remoting_apk/gen"/>
     <classpathentry kind="lib" path="third_party/android_tools/sdk/extras/google/gcm/gcm-client/dist/gcm.jar" sourcepath="third_party/android_tools/sdk/extras/google/gcm/gcm-client/src"/>
-    <classpathentry kind="lib" path="third_party/android_tools/sdk/platforms/android-24/android.jar" sourcepath="third_party/android_tools/sdk/sources/">
+    <classpathentry kind="lib" path="third_party/android_tools/sdk/platforms/android-23/android.jar" sourcepath="third_party/android_tools/sdk/sources/">
         <attributes>
             <attribute name="javadoc_location" value="http://developer.android.com/reference/"/>
         </attributes>
     </classpathentry>
-    <classpathentry kind="lib" path="third_party/android_tools/sdk/platforms/android-24/data/layoutlib.jar" sourcepath="third_party/android_tools/sdk/sources/"/>
-    <classpathentry kind="lib" path="third_party/android_tools/sdk/platforms/android-24/uiautomator.jar" sourcepath="third_party/android_tools/sdk/sources"/>
+    <classpathentry kind="lib" path="third_party/android_tools/sdk/platforms/android-23/data/layoutlib.jar" sourcepath="third_party/android_tools/sdk/sources/"/>
+    <classpathentry kind="lib" path="third_party/android_tools/sdk/platforms/android-23/uiautomator.jar" sourcepath="third_party/android_tools/sdk/sources"/>
     <classpathentry kind="lib" path="third_party/android_tools/sdk/extras/android/support/design/libs/android-support-design.jar" sourcepath="third_party/android_tools/sdk/sources"/>
     <classpathentry kind="lib" path="third_party/android_tools/sdk/extras/android/support/v7/mediarouter/libs/android-support-v7-mediarouter.jar" sourcepath="third_party/android_tools/sdk/sources"/>
     <classpathentry kind="lib" path="third_party/android_tools/sdk/extras/android/support/v7/recyclerview/libs/android-support-v7-recyclerview.jar" sourcepath="third_party/android_tools/sdk/sources"/>
     <classpathentry kind="lib" path="third_party/android_tools/sdk/extras/android/support/v13/android-support-v13.jar" sourcepath="third_party/android_tools/sdk/sources"/>
     <classpathentry kind="lib" path="third_party/android_tools/sdk/extras/android/support/v7/appcompat/libs/android-support-v7-appcompat.jar" sourcepath="third_party/android_tools/sdk/sources"/>
     <classpathentry kind="lib" path="third_party/bouncycastle/lib/bcprov-jdk16-1.46.jar"/>
     <classpathentry kind="lib" path="third_party/byte_buddy/lib/byte-buddy-1.4.17.jar"/>
     <classpathentry kind="lib" path="third_party/findbugs/lib/findbugs.jar"/>
     <classpathentry kind="lib" path="third_party/intellij/lib/annotations-12.0.jar"/>
     <classpathentry kind="lib" path="third_party/junit/src/lib/hamcrest-core-1.3.jar" sourcepath="third_party/junit/src/lib/hamcrest-core-1.3-sources.jar"/>
@@ skipping 57 matching lines @@
     <classpathentry kind="lib" path="out/Debug/lib.java/third_party/WebKit/public/blink_headers_java.jar"/>
     <classpathentry kind="lib" path="out/Debug/lib.java/ui/accessibility/ui_accessibility_java.jar"/>
     <classpathentry kind="lib" path="out/Debug/lib.java/ui/android/ui_java.jar"/>
 
     <!-- {% block additional_entries %} -->
     <!-- When this file is processed as a jinja2 template, additional
          <classpathentry> elements will be inserted here. -->
     <!-- {% endblock %} -->
 
 </classpath>