Revert "Update fix_fall_back_to_rtlgenrandom_when_bcryptprimitives_dll_is.patch"

This reverts commit fb2ea1104f688fc17dd72ceb193986f9419cb7af.

patches/chromium/fix_fall_back_to_rtlgenrandom_when_bcryptprimitives_dll_is.patch

@@ -1,103 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: John Kleinschmidt <kleinschmidtorama@gmail.com>
-Date: Wed, 25 Mar 2026 15:24:27 -0400
-Subject: fix: fall back to RtlGenRandom when bcryptprimitives.dll is
- unavailable
-
-When cross-compiling for Windows using Wine, bcryptprimitives.dll may not
-be available (e.g. Wine 6.0 does not implement it). This causes
-mksnapshot.exe to crash with a CHECK failure at rand_util_win.cc.
-
-Fall back to RtlGenRandom (advapi32 SystemFunction036) which is available
-on Wine and all Windows versions. This only affects the code path when
-LoadLibraryW for bcryptprimitives.dll fails, so real Windows builds are
-unaffected.
-
-diff --git a/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_base/rand_util_win.cc b/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_base/rand_util_win.cc
-index 1596bc2a31a29fd1fb08e8d6491253b04b1a5aaa..e37454348919f275a5f39cf3ac5d5e91af528be7 100644
---- a/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_base/rand_util_win.cc
-+++ b/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_base/rand_util_win.cc
-@@ -24,16 +24,32 @@ namespace partition_alloc::internal::base {
- void RandBytes(void* output, size_t output_length) {
-   // Import bcryptprimitives directly rather than cryptbase to avoid opening a
-   // handle to \\Device\KsecDD in the renderer.
-+  // Falls back to advapi32!RtlGenRandom when bcryptprimitives.dll is unavailable
-+  // (e.g. when running under Wine during cross-compilation).
-   // Note: we cannot use a magic static here as PA runs too early in process
-   // startup, but this should be safe as the process will be single-threaded
-   // when this first runs.
-   static decltype(&ProcessPrng) process_prng_fn = nullptr;
-   if (!process_prng_fn) {
-     HMODULE hmod = LoadLibraryW(L"bcryptprimitives.dll");
--    PA_BASE_CHECK(hmod);
--    process_prng_fn = reinterpret_cast<decltype(&ProcessPrng)>(
--        GetProcAddress(hmod, "ProcessPrng"));
--    PA_BASE_CHECK(process_prng_fn);
-+    if (hmod) {
-+      process_prng_fn = reinterpret_cast<decltype(&ProcessPrng)>(
-+          GetProcAddress(hmod, "ProcessPrng"));
-+    }
-+    if (!process_prng_fn) {
-+      // Fallback: use RtlGenRandom from advapi32.dll (available on Wine and
-+      // older Windows).
-+      using RtlGenRandomFn = BOOLEAN(WINAPI*)(PVOID, ULONG);
-+      HMODULE advapi = LoadLibraryW(L"advapi32.dll");
-+      PA_BASE_CHECK(advapi);
-+      RtlGenRandomFn rtl_gen_random = reinterpret_cast<RtlGenRandomFn>(
-+          GetProcAddress(advapi, "SystemFunction036"));
-+      PA_BASE_CHECK(rtl_gen_random);
-+      static RtlGenRandomFn stored_fn = rtl_gen_random;
-+      process_prng_fn = [](PBYTE pbData, SIZE_T cbData) -> BOOL {
-+        return stored_fn(pbData, static_cast<ULONG>(cbData)) ? TRUE : FALSE;
-+      };
-+    }
-   }
-   BOOL success = process_prng_fn(static_cast<BYTE*>(output), output_length);
-   // ProcessPrng is documented to always return TRUE.
-diff --git a/base/rand_util_win.cc b/base/rand_util_win.cc
-index c840303611d328c0dae30bdf5da42e6ccd787fea..e6423778e1b2a72b82e04d2dd3d15188b4fa3592 100644
---- a/base/rand_util_win.cc
-+++ b/base/rand_util_win.cc
-@@ -52,14 +52,36 @@ namespace {
- 
- // Import bcryptprimitives!ProcessPrng rather than cryptbase!RtlGenRandom to
- // avoid opening a handle to \\Device\KsecDD in the renderer.
-+// Falls back to advapi32!RtlGenRandom when bcryptprimitives.dll is unavailable
-+// (e.g. when running under Wine during cross-compilation).
- decltype(&ProcessPrng) GetProcessPrng() {
-   HMODULE hmod = LoadLibraryW(L"bcryptprimitives.dll");
--  CHECK(hmod);
--  decltype(&ProcessPrng) process_prng_fn =
--      reinterpret_cast<decltype(&ProcessPrng)>(
--          GetProcAddress(hmod, "ProcessPrng"));
--  CHECK(process_prng_fn);
--  return process_prng_fn;
-+  if (hmod) {
-+    decltype(&ProcessPrng) process_prng_fn =
-+        reinterpret_cast<decltype(&ProcessPrng)>(
-+            GetProcAddress(hmod, "ProcessPrng"));
-+    if (process_prng_fn) {
-+      return process_prng_fn;
-+    }
-+  }
-+
-+  // Fallback: use RtlGenRandom from advapi32.dll (available on Wine and
-+  // older Windows). RtlGenRandom has a different signature but we wrap it
-+  // to match ProcessPrng's BOOL(PBYTE, SIZE_T) contract.
-+  using RtlGenRandomFn = BOOLEAN(WINAPI*)(PVOID, ULONG);
-+  HMODULE advapi = LoadLibraryW(L"advapi32.dll");
-+  CHECK(advapi);
-+  RtlGenRandomFn rtl_gen_random = reinterpret_cast<RtlGenRandomFn>(
-+      GetProcAddress(advapi, "SystemFunction036"));
-+  CHECK(rtl_gen_random);
-+
-+  // Store in a static so the lambda-like wrapper can reference it.
-+  static RtlGenRandomFn stored_fn = rtl_gen_random;
-+  return [](PBYTE pbData, SIZE_T cbData) -> BOOL {
-+    // RtlGenRandom takes ULONG; cast is safe because callers never request
-+    // more than a few hundred bytes at a time.
-+    return stored_fn(pbData, static_cast<ULONG>(cbData)) ? TRUE : FALSE;
-+  };
- }
- 
- void RandBytesInternal(span<uint8_t> output, bool avoid_allocation) {