Update WebRTC test filter for Chromium tests.

In https://codereview.chromium.org/137793008/ phoglund@
changed the test filter for desktop tests after the renames in
https://codereview.chromium.org/131203005/ and
https://codereview.chromium.org/137753004/

This CL makes similar change for Android.

BUG=none
TBR=frankf@chromium.org
NOTRY=True

Review URL: https://codereview.chromium.org/144483003

git-svn-id: http://src.chromium.org/svn/trunk/src/build@247716 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/buildbot/bb_run_bot.py

@@ -179,7 +179,7 @@ def GetBotStepMap():
           extra_gyp='include_tests=1 enable_tracing=1')),
       B('webrtc-chromium-tests', H(std_test_steps),
         T(['webrtc_chromium'],
-          [flakiness_server, '--gtest-filter=Webrtc*:WebRTC*'])),
+          [flakiness_server, '--gtest-filter=WebRtc*'])),
       B('webrtc-native-tests', H(std_test_steps),
         T(['webrtc_native'], [flakiness_server])),