[Android] Fix reference to dex.py after it was moved in r192265.

BUG=

Review URL: https://codereview.chromium.org/13619009

git-svn-id: http://src.chromium.org/svn/trunk/src/build@192360 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

uiautomator_test.gypi

@@ -26,14 +26,14 @@
       'message': 'Dexing <(_target_name) jar',
       'inputs': [
         '<(DEPTH)/build/android/pylib/build_utils.py',
-        '<(DEPTH)/build/android/dex.py',
+        '<(DEPTH)/build/android/gyp/dex.py',
         '>@(library_dexed_jars_paths)',
       ],
       'outputs': [
         '<(output_dex_path)',
       ],
       'action': [
-        'python', '<(DEPTH)/build/android/dex.py',
+        'python', '<(DEPTH)/build/android/gyp/dex.py',
         '--dex-path=<(output_dex_path)',
         '--android-sdk-root=<(android_sdk_root)',