Fix lifetime of leveldb::MojoEnv instances.

components/leveldb/leveldb_app.cc

Index: components/leveldb/leveldb_app.cc
diff --git a/components/leveldb/leveldb_app.cc b/components/leveldb/leveldb_app.cc
index 93086f77aa5f23a3b6f3c29c9e643a8f6d1303a1..24ba1b0f9e23ae1b2e84d0e997de39cacfd3afdd 100644
--- a/components/leveldb/leveldb_app.cc
+++ b/components/leveldb/leveldb_app.cc
@@ -4,12 +4,16 @@
 
 #include "components/leveldb/leveldb_app.h"
 
+#include "base/debug/leak_annotations.h"
+#include "components/leveldb/env_mojo.h"
 #include "components/leveldb/leveldb_service_impl.h"
 #include "services/service_manager/public/cpp/service_context.h"
 
 namespace leveldb {
 
-LevelDBApp::LevelDBApp() : file_thread_("LevelDBFile") {
+LevelDBApp::LevelDBApp()
+    : file_thread_("LevelDBFile"),
+      env_(nullptr) {
   registry_.AddInterface<mojom::LevelDBService>(this);
 }
 
@@ -32,8 +36,11 @@ void LevelDBApp::Create(const service_manager::Identity& remote_identity,
   if (!service_) {
     if (!file_thread_.IsRunning())
       file_thread_.Start();
-    service_.reset(
-        new LevelDBServiceImpl(file_thread_.message_loop()->task_runner()));
+    if (!env_) {
+      env_ = new MojoEnv(file_thread_.message_loop()->task_runner());
+      ANNOTATE_LEAKING_OBJECT_PTR(env_);
+    }
+    service_.reset(new LevelDBServiceImpl(env_));
   }
   bindings_.AddBinding(service_.get(), std::move(request));
 }