Remove metrics_unittests isolate reference for Android.

This should have been done when removing the test in
https://codereview.chromium.org/117293002/

TBR=frankf@chromium.org
BUG=webrtc:1843
NOTRY=True

Review URL: https://codereview.chromium.org/105163004

git-svn-id: http://src.chromium.org/svn/trunk/src/build@241529 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/pylib/gtest/setup.py

@@ -48,7 +48,6 @@ _WEBRTC_ISOLATE_FILE_PATHS = {
       'modules/audio_coding/neteq4/audio_decoder_unittests.isolate',
     'common_audio_unittests': 'common_audio/common_audio_unittests.isolate',
     'common_video_unittests': 'common_video/common_video_unittests.isolate',
-    'metrics_unittests': 'test/metrics_unittests.isolate',
     'modules_tests': 'modules/modules_tests.isolate',
     'modules_unittests': 'modules/modules_unittests.isolate',
     'neteq_unittests': 'modules/audio_coding/neteq/neteq_unittests.isolate',