Misc. cleanup found while mucking with search engines code:

components/webdata/common/web_data_service_backend.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/webdata/common/web_data_service_backend.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "components/webdata/common/web_data_request_manager.h"
 #include "components/webdata/common/web_database.h"
@@ skipping 94 matching lines @@
     return task.Run(db_.get());
   }
   return scoped_ptr<WDTypedResult>();
 }
 
 WebDataServiceBackend::~WebDataServiceBackend() {
   ShutdownDatabase();
 }
 
 void WebDataServiceBackend::Commit() {
-  if (db_ && init_status_ == sql::INIT_OK) {
-    db_->CommitTransaction();
-    db_->BeginTransaction();
-  } else {
-    NOTREACHED() << "Commit scheduled after Shutdown()";
-  }
+  DCHECK(db_);
+  DCHECK_EQ(sql::INIT_OK, init_status_);
+  db_->CommitTransaction();
+  db_->BeginTransaction();
 }