Fix DCHECK when adding non ASCII bookmark from share extension.

ios/chrome/browser/share_extension/share_extension_item_receiver.mm

 // 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.
 
 #import "ios/chrome/browser/share_extension/share_extension_item_receiver.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/ios/block_types.h"
 #include "base/mac/bind_objc_block.h"
@@ skipping 202 matching lines @@
                                      [entryType integerValue]);
                              if (type == app_group::READING_LIST_ITEM) {
                                LogHistogramReceivedItem(READINGLIST_ENTRY);
                                _readingListModel->AddEntry(entryURL,
                                                            entryTitle);
                              }
                              if (type == app_group::BOOKMARK_ITEM) {
                                LogHistogramReceivedItem(BOOKMARK_ENTRY);
                                _bookmarkModel->AddURL(
                                    _bookmarkModel->mobile_node(), 0,
-                                   base::ASCIIToUTF16(entryTitle), entryURL);
+                                   base::UTF8ToUTF16(entryTitle), entryURL);
                              }
                              if (completion) {
                                web::WebThread::PostTask(web::WebThread::FILE,
                                                         FROM_HERE,
                                                         base::BindBlockArc(^() {
                                                           completion();
                                                         }));
                              }
                            }));
   return YES;
@@ skipping 108 matching lines @@
 
 - (NSOperationQueue*)presentedItemOperationQueue {
   return [NSOperationQueue mainQueue];
 }
 
 - (NSURL*)presentedItemURL {
   return app_group::ShareExtensionItemsFolder();
 }
 
 @end