[libfuzzer] store custom options in .GN build target instead of a separate file.

testing/libfuzzer/fuzzers/BUILD.gn

 # Copyright 2015 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.
 
 # Individual libfuzzer tests that didn't find their home yet.
 
 import("//build/config/features.gni")
 import("//media/media_options.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 
@@ skipping 40 matching lines @@
 
 if (proprietary_codecs) {
   fuzzer_test("mp4_box_reader_fuzzer") {
     sources = [
       "mp4_box_reader_fuzzer.cc",
     ]
     deps = [
       "//base",
       "//media",
     ]
-    libfuzzer_options = "mp4_box_reader_fuzzer.options"
+    libfuzzer_options = [ "max_len=500" ]
     dict = "dicts/mp4.dict"
   }
 }
 
 if (enable_mse_mpeg2ts_stream_parser) {
   fuzzer_test("es_parser_adts_fuzzer") {
     sources = [
       "es_parser_adts_fuzzer.cc",
     ]
     deps = [
@@ skipping 140 matching lines @@
 }
 
 fuzzer_test("icu_uregex_open_fuzzer") {
   sources = [
     "icu_uregex_open_fuzzer.cc",
   ]
   deps = [
     "//third_party/icu",
   ]
   dict = "dicts/icu_regex.dict"
-  libfuzzer_options = "icu_uregex_open_fuzzer.options"
+  libfuzzer_options = [ "max_len=128" ]
 }
 
 fuzzer_test("v8_script_parser_fuzzer") {
   sources = []
   deps = [
     "//v8:parser_fuzzer",
   ]
   dict = "dicts/js.dict"
 }
 
 fuzzer_test("v8_json_parser_fuzzer") {
   sources = []
   deps = [
     "//v8:json_fuzzer",
   ]
   dict = "dicts/json.dict"
 }
 
 fuzzer_test("v8_regexp_parser_fuzzer") {
   sources = []
   deps = [
     "//v8:regexp_fuzzer",
   ]
   dict = "dicts/regexp.dict"
-  libfuzzer_options = "v8_regexp_parser_fuzzer.options"
+  libfuzzer_options = [ "max_len=1024" ]
 }
 
 fuzzer_test("v8_wasm_fuzzer") {
   sources = []
   deps = [
     "//v8:wasm_fuzzer",
   ]
   dict = "dicts/v8_wasm.dict"
-  libfuzzer_options = "v8_wasm_fuzzer.options"
+  libfuzzer_options = [ "max_len=500" ]
 }
 
 fuzzer_test("v8_wasm_asmjs_fuzzer") {
   sources = []
   deps = [
     "//v8:wasm_asmjs_fuzzer",
   ]
 }
 
 fuzzer_test("third_party_re2_fuzzer") {
   sources = [
     "re2_fuzzer.cc",
   ]
   deps = [
     "//third_party/re2:re2",
   ]
-  libfuzzer_options = "re2_fuzzer.options"
+  libfuzzer_options = [ "max_len=32" ]
 }
 
 fuzzer_test("libxml_xml_regexp_compile_fuzzer") {
   sources = [
     "libxml_xml_regexp_compile_fuzzer.cc",
   ]
   deps = [
     "//third_party/libxml",
   ]
-  libfuzzer_options = "libxml_xml_regexp_compile_fuzzer.options"
+  libfuzzer_options = [ "max_len=32" ]
   additional_configs = [ "//testing/libfuzzer:no_clusterfuzz" ]
 }