Revert "Track thread activities in order to diagnose hangs."

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 262 matching lines @@
     "debug/debugger_posix.cc",
     "debug/debugger_win.cc",
     "debug/dump_without_crashing.cc",
     "debug/dump_without_crashing.h",
     "debug/gdi_debug_util_win.cc",
     "debug/gdi_debug_util_win.h",
 
     # This file depends on files from the "debug/allocator" target,
     # but this target does not depend on "debug/allocator" (see
     # allocator.gyp for details).
-    "debug/activity_analyzer.cc",
-    "debug/activity_analyzer.h",
-    "debug/activity_tracker.cc",
-    "debug/activity_tracker.h",
     "debug/leak_annotations.h",
     "debug/leak_tracker.h",
     "debug/proc_maps_linux.cc",
     "debug/proc_maps_linux.h",
     "debug/profiler.cc",
     "debug/profiler.h",
     "debug/stack_trace.cc",
     "debug/stack_trace.h",
     "debug/stack_trace_android.cc",
     "debug/stack_trace_posix.cc",
@@ skipping 1457 matching lines @@
     "cancelable_callback_unittest.cc",
     "command_line_unittest.cc",
     "containers/adapters_unittest.cc",
     "containers/hash_tables_unittest.cc",
     "containers/linked_list_unittest.cc",
     "containers/mru_cache_unittest.cc",
     "containers/scoped_ptr_hash_map_unittest.cc",
     "containers/small_map_unittest.cc",
     "containers/stack_container_unittest.cc",
     "cpu_unittest.cc",
-    "debug/activity_analyzer_unittest.cc",
-    "debug/activity_tracker_unittest.cc",
     "debug/crash_logging_unittest.cc",
     "debug/debugger_unittest.cc",
     "debug/leak_tracker_unittest.cc",
     "debug/proc_maps_linux_unittest.cc",
     "debug/stack_trace_unittest.cc",
     "debug/task_annotator_unittest.cc",
     "deferred_sequenced_task_runner_unittest.cc",
     "environment_unittest.cc",
     "feature_list_unittest.cc",
     "file_version_info_win_unittest.cc",
@@ skipping 674 matching lines @@
 
   # GYP: //base.gyp:base_java_unittest_support
   android_library("base_java_unittest_support") {
     deps = [
       ":base_java",
     ]
     java_files =
         [ "test/android/java/src/org/chromium/base/ContentUriTestUtils.java" ]
   }
 }