Use explicit WebString <-> string16 conversion methods in storage API files (2)

content/renderer/dom_storage/local_storage_area.cc

 // Copyright 2016 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/renderer/dom_storage/local_storage_area.h"
 
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 
@@ skipping 11 matching lines @@
 
 LocalStorageArea::~LocalStorageArea() {
   cached_area_->AreaDestroyed(this);
 }
 
 unsigned LocalStorageArea::length() {
   return cached_area_->GetLength();
 }
 
 WebString LocalStorageArea::key(unsigned index) {
-  return cached_area_->GetKey(index);
+  return WebString::fromUTF16(cached_area_->GetKey(index));
 }
 
 WebString LocalStorageArea::getItem(const WebString& key) {
-  return cached_area_->GetItem(key);
+  return WebString::fromUTF16(cached_area_->GetItem(key.utf16()));
 }
 
 void LocalStorageArea::setItem(
     const WebString& key, const WebString& value, const WebURL& page_url,
     WebStorageArea::Result& result) {
-  if (!cached_area_->SetItem(key, value, page_url, id_))
+  if (!cached_area_->SetItem(key.utf16(), value.utf16(), page_url, id_))
     result = ResultBlockedByQuota;
   else
     result = ResultOK;
 }
 
 void LocalStorageArea::removeItem(
     const WebString& key, const WebURL& page_url) {
-  cached_area_->RemoveItem(key, page_url, id_);
+  cached_area_->RemoveItem(key.utf16(), page_url, id_);
 }
 
 void LocalStorageArea::clear(const WebURL& page_url) {
   cached_area_->Clear(page_url, id_);
 }
 
 }  // namespace content