IndexedDB: Convert decoding functions to pass StringPieces vs. pointers

content/browser/indexed_db/leveldb/leveldb_transaction.cc

 // Copyright (c) 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 "content/browser/indexed_db/leveldb/leveldb_transaction.h"
 
 #include "base/logging.h"
 #include "content/browser/indexed_db/leveldb/leveldb_database.h"
 #include "content/browser/indexed_db/leveldb/leveldb_slice.h"
 #include "content/browser/indexed_db/leveldb/leveldb_write_batch.h"
@@ skipping 60 matching lines @@
 void LevelDBTransaction::Put(const LevelDBSlice& key,
                              const std::vector<char>& value) {
   Set(key, value, false);
 }
 
 void LevelDBTransaction::Remove(const LevelDBSlice& key) {
   Set(key, std::vector<char>(), true);
 }
 
 bool LevelDBTransaction::Get(const LevelDBSlice& key,
-                             std::vector<char>& value,
+                             std::string* value,
                              bool& found) {
   found = false;
   DCHECK(!finished_);
   AVLTreeNode* node = tree_.Search(key);
 
   if (node) {
     if (node->deleted)
       return true;
 
-    value = node->value;
+    value->assign(node->value.begin(), node->value.end());
     found = true;
     return true;
   }
 
   bool ok = db_->Get(key, value, found, &snapshot_);
   if (!ok) {
     DCHECK(!found);
     return false;
   }
   return true;
@@ skipping 377 matching lines @@
 
   if (!db_->Write(*write_batch_))
     return false;
 
   finished_ = true;
   write_batch_->Clear();
   return true;
 }
 
 }  // namespace content