chore: remove obsolete v8 patches (#16910)

* patches/common/v8/disable-warning-win.patch
  added in https://github.com/electron/libchromiumcontent/pull/483
* patches/common/v8/ostreams.patch
  added in https://github.com/electron/libchromiumcontent/pull/258

patches/common/v8/.patches

@@ -2,10 +2,8 @@ deps_backport_detailed_line_info_for_cpu_profiler.patch
 add_realloc.patch
 build_gn.patch
 array_buffer.patch
-ostreams.patch
 export_platform.patch
 dcheck.patch
-disable-warning-win.patch
 expose_mksnapshot.patch
 build-torque-with-x64-toolchain-on-arm.patch
 do_not_run_arm_arm64_mksnapshot_binaries.patch

patches/common/v8/disable-warning-win.patch

@@ -1,22 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Nitish Sakhawalkar <nitsakh@icloud.com>
-Date: Mon, 22 Oct 2018 10:47:12 -0700
-Subject: disable-warning-win.patch
-
-Disable unit test windows build warning
-
-diff --git a/test/unittests/base/bits-unittest.cc b/test/unittests/base/bits-unittest.cc
-index 6f787eb72783570812f7cbda57b836df56b5f2cb..c36dfcc836d6351d11d2178a8e6c3556b3ff3422 100644
---- a/test/unittests/base/bits-unittest.cc
-+++ b/test/unittests/base/bits-unittest.cc
-@@ -13,7 +13,9 @@
- #else
- #define DISABLE_IN_RELEASE(Name) DISABLED_##Name
- #endif
--
-+#ifdef _WIN32
-+#pragma warning(disable:4724 4723)  // Disable potential divide by 0 warnings
-+#endif
- namespace v8 {
- namespace base {
- namespace bits {

patches/common/v8/ostreams.patch

@@ -1,19 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Cheng Zhao <zcbenz@gmail.com>
-Date: Mon, 22 Oct 2018 10:47:12 -0700
-Subject: ostreams.patch
-
-
-diff --git a/src/ostreams.h b/src/ostreams.h
-index 189f5384b99438f3dad1d77a0836ceb45f6ed938..83a5930d4bd690dde01749bcd88acb11d75aa0cb 100644
---- a/src/ostreams.h
-+++ b/src/ostreams.h
-@@ -32,7 +32,7 @@ class V8_EXPORT_PRIVATE OFStreamBase : public std::streambuf {
- };
- 
- // An output stream writing to a file.
--class V8_EXPORT_PRIVATE OFStream : public std::ostream {
-+class V8_EXPORT_PRIVATE OFStream : public NON_EXPORTED_BASE(std::ostream) {
-  public:
-   explicit OFStream(FILE* f);
-   ~OFStream() override = default;