Refactor CallbackHelper to base/test

base/BUILD.gn

 # Copyright (c) 2013 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.
 
 # HOW TO WRITE CONDITIONALS IN THIS FILE
 # ======================================
 #
 # In many other places, one would write a conditional that expresses all the
 # cases when a source file is used or unused, and then either add or subtract
 # it from the sources list in that case
@@ skipping 2348 matching lines @@
       ":base_java",
       "//testing/android/reporter:reporter_java",
       "//third_party/hamcrest:hamcrest_core_java",
     ]
     java_files = [
       "test/android/javatests/src/org/chromium/base/test/BaseActivityInstrumentationTestCase.java",
       "test/android/javatests/src/org/chromium/base/test/BaseChromiumInstrumentationTestRunner.java",
       "test/android/javatests/src/org/chromium/base/test/BaseInstrumentationTestRunner.java",
       "test/android/javatests/src/org/chromium/base/test/BaseTestResult.java",
       "test/android/javatests/src/org/chromium/base/test/util/AdvancedMockContext.java",
+      "test/android/javatests/src/org/chromium/base/test/util/CallbackHelper.java",
       "test/android/javatests/src/org/chromium/base/test/util/CommandLineFlags.java",
       "test/android/javatests/src/org/chromium/base/test/util/DisableIf.java",
       "test/android/javatests/src/org/chromium/base/test/util/DisableIfSkipCheck.java",
       "test/android/javatests/src/org/chromium/base/test/util/DisabledTest.java",
       "test/android/javatests/src/org/chromium/base/test/util/EnormousTest.java",
       "test/android/javatests/src/org/chromium/base/test/util/Feature.java",
       "test/android/javatests/src/org/chromium/base/test/util/FlakyTest.java",
       "test/android/javatests/src/org/chromium/base/test/util/InMemorySharedPreferences.java",
       "test/android/javatests/src/org/chromium/base/test/util/InstrumentationUtils.java",
       "test/android/javatests/src/org/chromium/base/test/util/IntegrationTest.java",
@@ skipping 69 matching lines @@
     testonly = true
     deps = [
       ":base_java",
     ]
     java_files = [
       "test/android/java/src/org/chromium/base/ContentUriTestUtils.java",
       "test/android/java/src/org/chromium/base/TestSystemMessageHandler.java",
     ]
   }
 }