Use std::move instead of base::Passed with base::BindOnce.

Chromium change:

https://source.chromium.org/chromium/chromium/src/+/64da068f017ecd585a60f420f98270b3469397c1

commit 64da068f017ecd585a60f420f98270b3469397c1
Author: Daniel Cheng <dcheng@chromium.org>
Date:   Tue Mar 16 07:30:09 2021 +0000

    [base] Disallow base::BindOnce() + base::Passed() everywhere.

    std::move() and base::Passed() mean the same thing for base::BindOnce(),
    so use the standard library idiom instead.

    Bug: 1180750

ios/browser/api/bookmarks/importer/brave_bookmarks_importer.mm

@@ -150,7 +150,7 @@ - (void)importFromFile:(NSString*)filePath
         // Import into the Profile/ChromeBrowserState on the main-thread.
         base::PostTask(
             FROM_HERE, {web::WebThread::UI},
-            base::BindOnce(complete_import, base::Passed(std::move(bookmarks)),
+            base::BindOnce(complete_import, std::move(bookmarks),
                            top_level_folder_name, listener));
       } else {
         listener(BraveBookmarksImporterStateCompleted,

vendor/brave-ios/Ads/BATBraveAds.mm

@@ -1159,8 +1159,7 @@ - (void)runDBTransaction:(ads::DBTransactionPtr)transaction
   base::PostTaskAndReplyWithResult(
       databaseQueue.get(),
       FROM_HERE,
-      base::BindOnce(&RunDBTransactionOnTaskRunner,
-          base::Passed(std::move(transaction)),
+      base::BindOnce(&RunDBTransactionOnTaskRunner, std::move(transaction),
           adsDatabase),
       base::BindOnce(^(ads::DBCommandResponsePtr response) {
         const auto strongSelf = weakSelf;

vendor/brave-ios/Ledger/BATBraveLedger.mm

@@ -1871,8 +1871,7 @@ - (void)runDBTransaction:(ledger::type::DBTransactionPtr)transaction
   base::PostTaskAndReplyWithResult(
       databaseQueue.get(),
       FROM_HERE,
-      base::BindOnce(&RunDBTransactionOnTaskRunner,
-          base::Passed(std::move(transaction)),
+      base::BindOnce(&RunDBTransactionOnTaskRunner, std::move(transaction),
           rewardsDatabase),
       base::BindOnce(^(ledger::type::DBCommandResponsePtr response) {
         if (weakSelf)