Revert "Reland "[flags] Enable freezing of flags""

This reverts commit d34170f2.

Reason for revert: "The (hopefully) last issue in chromium is fixed"
  Narrator: It wasn't -- https://ci.chromium.org/ui/p/chromium/builders/try/cast_shell_linux/1260757/overview

Original change's description:
> Reland "[flags] Enable freezing of flags"
>
> This is a reland of commit 1ed7d0b8.
> The (hopefully) last issue in chromium is fixed in https://crrev.com/c/3745533.
>
> Original change's description:
> > [flags] Enable freezing of flags
> >
> > This enables the --freeze-flags-after-init flag globally. Note that
> > tests, fuzzers, Node and other still explicitly disable the flag. The
> > chrome renderer process and default d8 execution will have it enabled
> > though.
> >
> > R=cbruni@chromium.org
> >
> > Bug: v8:12887
> > Change-Id: I9a15ef64227e5e6e04779d8d671a2c50d99c9097
> > Cq-Include-Trybots: luci.v8.try:v8_linux_blink_rel
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3695264
> > Reviewed-by: Camillo Bruni <cbruni@chromium.org>
> > Commit-Queue: Clemens Backes <clemensb@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#81214}
>
> Bug: v8:12887
> Change-Id: I6445c04abc55242d6e2f204d45ec9ce22c6ece34
> Cq-Include-Trybots: luci.v8.try:v8_linux_blink_rel
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3707284
> Reviewed-by: Camillo Bruni <cbruni@chromium.org>
> Commit-Queue: Clemens Backes <clemensb@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#81603}

No-try: true
Bug: v8:12887
Change-Id: I73e0a52974a2730386e805b7de98de8d87e2d208
Cq-Include-Trybots: luci.v8.try:v8_linux_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3749584
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81621}

src/flags/flag-definitions.h

@@ -1903,7 +1903,7 @@ DEFINE_BOOL(
     "Fuzzers use this flag to signal that they are ... fuzzing. This causes "
     "intrinsics to fail silently (e.g. return undefined) on invalid usage.")
 
-DEFINE_BOOL(freeze_flags_after_init, true,
+DEFINE_BOOL(freeze_flags_after_init, false,
             "Disallow changes to flag values after initializing V8")
 
 // mksnapshot.cc