Do not delete blink::WebRTCCertificateCallback on non-main thread

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 1848 matching lines @@
     "process/process_util_unittest.cc",
     "profiler/stack_sampling_profiler_unittest.cc",
     "profiler/tracked_time_unittest.cc",
     "rand_util_unittest.cc",
     "run_loop_unittest.cc",
     "scoped_clear_errno_unittest.cc",
     "scoped_generic_unittest.cc",
     "scoped_native_library_unittest.cc",
     "security_unittest.cc",
     "sequence_checker_unittest.cc",
+    "sequenced_task_runner_unittest.cc",
     "sha1_unittest.cc",
     "stl_util_unittest.cc",
     "strings/nullable_string16_unittest.cc",
     "strings/pattern_unittest.cc",
     "strings/safe_sprintf_unittest.cc",
     "strings/string16_unittest.cc",
     "strings/string_number_conversions_unittest.cc",
     "strings/string_piece_unittest.cc",
     "strings/string_split_unittest.cc",
     "strings/string_tokenizer_unittest.cc",
@@ skipping 553 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" ]
   }
 }