indexeddb: use filesystem proxy for ChromiumEnv

When indexeddb moves to the storage service, this static getter will use
the file system proxy for the storage service instead of an unrestricted
one.

See: https://chromium-review.googlesource.com/c/chromium/src/+/2079642

Bug: 1052045
Change-Id: I8e02c888ea548d4fd60bda4c221f785a442a3aab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333057
Auto-Submit: enne <enne@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794671}

content/browser/indexed_db/indexed_db_leveldb_env.cc

@@ -4,9 +4,12 @@
 
 #include "content/browser/indexed_db/indexed_db_leveldb_env.h"
 
+#include "components/services/storage/filesystem_proxy_factory.h"
+
 namespace content {
 
-IndexedDBLevelDBEnv::IndexedDBLevelDBEnv() : ChromiumEnv("LevelDBEnv.IDB") {}
+IndexedDBLevelDBEnv::IndexedDBLevelDBEnv()
+    : ChromiumEnv("LevelDBEnv.IDB", storage::CreateFilesystemProxy()) {}
 
 IndexedDBLevelDBEnv* IndexedDBLevelDBEnv::Get() {
   static base::NoDestructor<IndexedDBLevelDBEnv> g_leveldb_env;