[libfuzzer] unittest-style main driver.

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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 627 matching lines @@
       "//components/constrained_window:unit_tests",
       "//components/enhanced_bookmarks:test_support",
       "//components/metrics:serialization",
       "//components/password_manager/content/renderer:browser_tests",
       "//components/rappor:unit_tests",
       "//components/sessions:unit_tests",
       "//media/blink:media_blink_unittests",
       "//media/cast:udp_proxy",
       "//native_client/src/trusted/debug_stub:gdb_rsp_unittest",
       "//storage/browser:dump_file_system",
+      "//testing/libfuzzer/fuzzers",
+      "//testing/libfuzzer/tests:libfuzzer_tests",
       "//third_party/angle:libANGLE",
       "//third_party/angle:libEGL",
       "//third_party/angle:libGLESv2",
       "//third_party/cld_2:cld_2_dynamic_data_tool",
       "//third_party/leveldatabase:leveldb_arena_test",
       "//third_party/leveldatabase:leveldb_bloom_test",
       "//third_party/leveldatabase:leveldb_cache_test",
       "//third_party/leveldatabase:leveldb_corruption_test",
       "//third_party/leveldatabase:leveldb_crc32c_test",
       "//third_party/leveldatabase:leveldb_db_bench",
@@ skipping 63 matching lines @@
       "//build/android/incremental_install:bootstrap_java",
     ]
   }
 
   if (!is_chromecast && (is_android || is_linux || is_chromeos)) {
     deps += [
       "//blimp",
       "//blimp:blimp_tests",
     ]
   }
-
-  if (use_libfuzzer || use_drfuzz) {
-    # these are needed only for gn to discover build files.
-    deps += [
-      "//testing/libfuzzer:libfuzzer_main",
-      "//testing/libfuzzer/fuzzers:string_to_int_fuzzer",
-      "//testing/libfuzzer/tests:libfuzzer_tests",
-    ]
-  }
 }
 
 group("gn_mojo_targets") {
   testonly = true
   if (is_linux && !is_chromeos) {
     # TODO(GYP): Figure out if any of these should be in gn_all
     # and figure out how cross-platform they are
     deps = [
       "//ipc/mojo:ipc_mojo_perftests",
       "//media/mojo:tests",
@@ skipping 122 matching lines @@
       ]
 
       if (target_cpu == "x86") {
         deps += [ "//chrome/tools/crash_service:crash_service_win64" ]
       }
     } else {
       deps += [ "//breakpad:minidump_stackwalk($host_toolchain)" ]
     }
   }
 }