[libfuzzer] Added script for dictionary generation.

net/BUILD.gn

Index: net/BUILD.gn
diff --git a/net/BUILD.gn b/net/BUILD.gn
index a8f04e4cc20ebba613c95f33dd05fc563249e9f3..ec45dbc399f63b9e3a681174d78801280e66ec5c 100644
--- a/net/BUILD.gn
+++ b/net/BUILD.gn
@@ -1968,7 +1968,7 @@ fuzzer_test("net_http_stream_parser_fuzzer") {
     "//base",
     "//net",
   ]
-  dict = "data/http/http.dict"
+  dict = "data/dicts/generated/net_http_stream_parser_fuzzer.dict"
 }
 
 fuzzer_test("net_ftp_ctrl_response_fuzzer") {
@@ -2014,6 +2014,7 @@ fuzzer_test("net_websocket_frame_parser_fuzzer") {
     ":net_fuzzer_test_support",
     "//net",
   ]
+  dict = "data/dicts/generated/net_websocket_frame_parser_fuzzer.dict"
 }
 
 fuzzer_test("net_http_chunked_decoder_fuzzer") {
@@ -2037,7 +2038,7 @@ fuzzer_test("net_http_proxy_client_socket_fuzzer") {
     "//base",
     "//net",
   ]
-  dict = "data/http/http.dict"
+  dict = "data/dicts/generated/net_http_proxy_client_socket_fuzzer.dict"
 }
 
 fuzzer_test("net_quic_crypto_framer_parse_message_fuzzer") {
@@ -2085,5 +2086,5 @@ fuzzer_test("net_url_request_fuzzer") {
     "//base",
     "//net",
   ]
-  dict = "data/http/http.dict"
+  dict = "data/dicts/generated/net_url_request_fuzzer.dict"
 }