ios: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

ios/chrome/browser/net/retryable_url_fetcher_unittest.mm

 // Copyright 2014 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/net/retryable_url_fetcher.h"
 
 #import "base/mac/scoped_nsobject.h"
 #include "ios/web/public/test/test_web_thread.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "net/url_request/url_fetcher_delegate.h"
@@ skipping 42 matching lines @@
   }
 
   net::TestURLFetcherFactory factory_;
   scoped_ptr<web::TestWebThread> io_thread_;
   base::MessageLoop message_loop_;
   base::scoped_nsobject<TestRetryableURLFetcherDelegate> test_delegate_;
 };
 
 TEST_F(RetryableURLFetcherTest, TestResponse200) {
   scoped_refptr<net::URLRequestContextGetter> request_context_getter =
-      new net::TestURLRequestContextGetter(message_loop_.message_loop_proxy());
+      new net::TestURLRequestContextGetter(message_loop_.task_runner());
   base::scoped_nsobject<RetryableURLFetcher> retryableFetcher(
       [[RetryableURLFetcher alloc]
           initWithRequestContextGetter:request_context_getter.get()
                               delegate:test_delegate_.get()
                          backoffPolicy:nil]);
   [retryableFetcher startFetch];
 
   // Manually calls the delegate.
   net::TestURLFetcher* fetcher = factory_.GetFetcherByID(0);
   DCHECK(fetcher);
   DCHECK(fetcher->delegate());
   [test_delegate_ setResponsesProcessed:0U];
   fetcher->set_response_code(200);
   fetcher->SetResponseString([kFakeResponseString UTF8String]);
   fetcher->delegate()->OnURLFetchComplete(fetcher);
   EXPECT_EQ(1U, [test_delegate_ responsesProcessed]);
 }
 
 TEST_F(RetryableURLFetcherTest, TestResponse404) {
   scoped_refptr<net::URLRequestContextGetter> request_context_getter =
-      new net::TestURLRequestContextGetter(message_loop_.message_loop_proxy());
+      new net::TestURLRequestContextGetter(message_loop_.task_runner());
   base::scoped_nsobject<RetryableURLFetcher> retryableFetcher(
       [[RetryableURLFetcher alloc]
           initWithRequestContextGetter:request_context_getter.get()
                               delegate:test_delegate_.get()
                          backoffPolicy:nil]);
   [retryableFetcher startFetch];
 
   // Manually calls the delegate.
   net::TestURLFetcher* fetcher = factory_.GetFetcherByID(0);
   DCHECK(fetcher);
   DCHECK(fetcher->delegate());
   [test_delegate_ setResponsesProcessed:0U];
   fetcher->set_response_code(404);
   fetcher->SetResponseString("");
   fetcher->delegate()->OnURLFetchComplete(fetcher);
   EXPECT_EQ(0U, [test_delegate_ responsesProcessed]);
 }
 
 }  // namespace