Remove som GYP annotations, remove unused manifest.

testing/android/junit/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 assert(is_android)
 
 import("//build/config/android/rules.gni")
 
-# GYP: //testing/android/junit_test.gyp:junit_test_support
 java_library("junit_test_support") {
   testonly = true
   java_files = [
     "java/src/org/chromium/testing/local/BackgroundShadowAsyncTask.java",
     "java/src/org/chromium/testing/local/CustomShadowAsyncTask.java",
     "java/src/org/chromium/testing/local/GtestComputer.java",
     "java/src/org/chromium/testing/local/GtestFilter.java",
     "java/src/org/chromium/testing/local/GtestListener.java",
     "java/src/org/chromium/testing/local/GtestLogger.java",
     "java/src/org/chromium/testing/local/JsonListener.java",
@@ skipping 10 matching lines @@
     "//third_party/robolectric:android-all-5.0.0_r2-robolectric-1",
     "//third_party/robolectric:robolectric_annotations_java",
     "//third_party/robolectric:robolectric_java",
     "//third_party/robolectric:robolectric_resources_java",
     "//third_party/robolectric:robolectric_utils_java",
     "//third_party/robolectric:shadows-core-3.0-21",
     "//third_party/robolectric:shadows-multidex-3.0",
   ]
 }
 
-# GYP: //testing/android/junit_test.gyp:junit_unit_tests
 junit_binary("junit_unit_tests") {
   java_files = [
     "javatests/src/org/chromium/testing/local/GtestFilterTest.java",
     "javatests/src/org/chromium/testing/local/GtestLoggerTest.java",
     "javatests/src/org/chromium/testing/local/PackageFilterTest.java",
     "javatests/src/org/chromium/testing/local/RunnerFilterTest.java",
   ]
 }