[SyzyAsan] Disable registry filter for sandboxed processes.

syzygy/agent/asan/registry_cache.cc

Index: syzygy/agent/asan/registry_cache.cc
diff --git a/syzygy/agent/asan/registry_cache.cc b/syzygy/agent/asan/registry_cache.cc
index 8d6a42ddc1f925135ae936b87dae9ca7f73820fe..12a3d24151e378f75ffa99942066aff19e925171 100644
--- a/syzygy/agent/asan/registry_cache.cc
+++ b/syzygy/agent/asan/registry_cache.cc
@@ -59,7 +59,18 @@ RegistryCache::RegistryCache(const wchar_t* registry_name,
   registry_cache_key_.append(registry_name);
 }
 
+// static
+bool RegistryCache::RegistryAvailable() {
+  base::win::RegKey test_key(kRegistryRootKey, L"SYSTEM", KEY_ALL_ACCESS);
+  if (!test_key.Valid())
+    return false;
+  test_key.Close();
+  return true;
+}
+
 bool RegistryCache::Init() {
+  DCHECK(RegistryAvailable());
+
   // Always start by cleaning up the values, to limit the size of entries in
   // the registry.
   CleanUp();