build: remove deleted V8 headers from metadata inputs

Remove two inline headers deleted by the V8 15.2 update from the
postmortem-metadata inputs. Their remaining references prevent Ninja
from building the target.

Assisted-by: Codex
Signed-off-by: inoway46 <inoueyuya416@gmail.com>
PR-URL: #66531
Refs: #65161
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

Author: inoway46

tools/v8_gypfiles/v8.gyp

@@ -2342,7 +2342,6 @@
           '<(V8_ROOT)/src/objects/code.h',
           '<(V8_ROOT)/src/objects/code-inl.h',
           '<(V8_ROOT)/src/objects/cpp-heap-external-object.h',
-          '<(V8_ROOT)/src/objects/cpp-heap-external-object-inl.h',
           '<(V8_ROOT)/src/objects/cpp-heap-object-wrapper.h',
           '<(V8_ROOT)/src/objects/cpp-heap-object-wrapper-inl.h',
           '<(V8_ROOT)/src/objects/data-handler.h',
@@ -2396,7 +2395,6 @@
           '<(V8_ROOT)/src/objects/oddball.h',
           '<(V8_ROOT)/src/objects/oddball-inl.h',
           '<(V8_ROOT)/src/objects/primitive-heap-object.h',
-          '<(V8_ROOT)/src/objects/primitive-heap-object-inl.h',
           '<(V8_ROOT)/src/objects/scope-info.h',
           '<(V8_ROOT)/src/objects/scope-info-inl.h',
           '<(V8_ROOT)/src/objects/script.cc',