Update SandboxPrioritizedOriginDatabase to respect incognito.

Sandbox prioritized origin database creates an on-disk file for the
prioritized origin. This is disabled for in-memory file system to avoid
writing file mappings to the disk.

Bug: 93417
Change-Id: Ie6a251e7fae40b513bc2247ce07e09052ce469a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1572401Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Auto-Submit: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652556}

storage/browser/fileapi/sandbox_prioritized_origin_database.cc

@@ -10,6 +10,7 @@
 #include "base/pickle.h"
 #include "storage/browser/fileapi/sandbox_isolated_origin_database.h"
 #include "storage/browser/fileapi/sandbox_origin_database.h"
+#include "third_party/leveldatabase/leveldb_chrome.h"
 
 namespace storage {
 
@@ -62,7 +63,9 @@ SandboxPrioritizedOriginDatabase::~SandboxPrioritizedOriginDatabase() = default;
 
 bool SandboxPrioritizedOriginDatabase::InitializePrimaryOrigin(
     const std::string& origin) {
-  if (!primary_origin_database_) {
+  const bool is_in_memory =
+      env_override_ && leveldb_chrome::IsMemEnv(env_override_);
+  if (!primary_origin_database_ && !is_in_memory) {
     if (!MaybeLoadPrimaryOrigin() && ResetPrimaryOrigin(origin)) {
       MaybeMigrateDatabase(origin);
       primary_origin_database_.reset(