Log IDB leveldb uma stats into LevelDBEnv.IDB. Other LevelDB consumers will

third_party/leveldatabase/env_idb.h

Index: third_party/leveldatabase/env_idb.h
diff --git a/base/test/main_hook.cc b/third_party/leveldatabase/env_idb.h
similarity index 58%
copy from base/test/main_hook.cc
copy to third_party/leveldatabase/env_idb.h
index f1f196160d52da36db7a34ac3e9c8c8e7d17a19c..d68b5ce8689ca8bfed57df9725591b5ed5b0d101 100644
--- a/base/test/main_hook.cc
+++ b/third_party/leveldatabase/env_idb.h
@@ -2,8 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/test/main_hook.h"
+#ifndef THIRD_PARTY_LEVELDATABASE_ENV_IDB_H_
+#define THIRD_PARTY_LEVELDATABASE_ENV_IDB_H_
+
+namespace leveldb {
+
+Env* IDBEnv();
+
+}
 
-#if !defined(OS_IOS)
-MainHook::MainHook(MainType main_func, int argc, char* argv[]) {}
 #endif