Revert "[iwyu] Add missing includes"

This reverts commit e8a22a70.

Reason for revert: Depends on another reverted CL: https://crrev.com/c/1337585

Original change's description:
> [iwyu] Add missing includes
> 
> This fixes a presubmit error:
> https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Presubmit/454
> 
> It also adds another missing include.
> 
> R=​machenbach@chromium.org
> CC=​caitp@igalia.com
> 
> Bug: v8:7490
> Change-Id: I915a5bf431073410a67ff08471fd5e6974e31aa1
> No-Try: true
> No-Tree-Checks: true
> Reviewed-on: https://chromium-review.googlesource.com/c/1346111
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#57671}

TBR=machenbach@chromium.org,clemensh@chromium.org

Change-Id: Id01d5ff327bc50f8d21a4092ba881f5d5e982a92
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7490
Reviewed-on: https://chromium-review.googlesource.com/c/1346117Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57678}

src/builtins/builtins-object-gen.cc

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "src/builtins/builtins-object-gen.h"
-
 #include "src/builtins/builtins-utils-gen.h"
 #include "src/builtins/builtins.h"
 #include "src/code-stub-assembler.h"
@@ -13,7 +11,6 @@
 #include "src/objects/js-generator.h"
 #include "src/objects/property-descriptor-object.h"
 #include "src/objects/shared-function-info.h"
-#include "src/property-details.h"
 
 namespace v8 {
 namespace internal {