Deprecate hpack_table_size flag, remove dead code.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index a325e9fa58ae53ea8fad8a94b96db64857cb9b56..1c9bb954acc172fdc2c56d5fd2b2375273cbb6ae 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -235,8 +235,6 @@ group("both_gn_and_gyp") {
       "//gpu/khronos_glcts_support:khronos_glcts_test",
       "//jingle:jingle_unittests",
       "//net:hpack_example_generator",
-      "//net:hpack_fuzz_mutator",
-      "//net:hpack_fuzz_wrapper",
       "//ppapi:ppapi_unittests",
       "//ppapi/examples/2d",
       "//ppapi/examples/audio",
@@ -1044,7 +1042,6 @@ if (!is_ios && !is_android && !is_chromecast) {
     if (!is_win) {
       deps += [
         "//net:dns_fuzz_stub",
-        "//net:hpack_fuzz_wrapper",
         "//skia:filter_fuzz_stub",
       ]
     }