Convert Pass()→std::move() for iOS build.

ios/web/webui/crw_web_ui_manager.mm

 // Copyright 2015 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/web/webui/crw_web_ui_manager.h"
 
 #include "base/mac/bind_objc_block.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/scoped_vector.h"
 #import "base/strings/sys_string_conversions.h"
@@ skipping 137 matching lines @@
 - (void)fetchResourceWithURL:(const GURL&)URL
            completionHandler:(void (^)(NSData*))completionHandler {
   base::WeakNSObject<CRWWebUIManager> weakSelf(self);
   web::URLFetcherBlockAdapterCompletion fetcherCompletion =
       ^(NSData* data, web::URLFetcherBlockAdapter* fetcher) {
         completionHandler(data);
         [weakSelf removeFetcher:fetcher];
       };
 
   _fetchers.push_back(
-      [self fetcherForURL:URL completionHandler:fetcherCompletion].Pass());
+      [self fetcherForURL:URL completionHandler:fetcherCompletion]);
   _fetchers.back()->Start();
 }
 
 - (BOOL)handleWebUIJSMessage:(const base::DictionaryValue&)message {
   std::string command;
   if (!message.GetString("message", &command) ||
       command != "webui.requestFavicon") {
     DLOG(WARNING) << "Unexpected message received" << command;
     return NO;
   }
@@ skipping 45 matching lines @@
 
 - (scoped_ptr<web::URLFetcherBlockAdapter>)
         fetcherForURL:(const GURL&)URL
     completionHandler:(web::URLFetcherBlockAdapterCompletion)handler {
   return scoped_ptr<web::URLFetcherBlockAdapter>(
       new web::URLFetcherBlockAdapter(
           URL, _webState->GetBrowserState()->GetRequestContext(), handler));
 }
 
 @end