Remove all remaining traces of MessageLoopProxy.

ios/chrome/browser/net/ios_chrome_url_request_context_getter.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_NET_IOS_CHROME_URL_REQUEST_CONTEXT_GETTER_H_
 #define IOS_CHROME_BROWSER_NET_IOS_CHROME_URL_REQUEST_CONTEXT_GETTER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 12 matching lines @@
 // the destructor and GetURLRequestContext().
 class IOSChromeURLRequestContextGetter : public net::URLRequestContextGetter {
  public:
   // Constructs a ChromeURLRequestContextGetter that will use |factory| to
   // create the URLRequestContext.
   explicit IOSChromeURLRequestContextGetter(
       std::unique_ptr<IOSChromeURLRequestContextFactory> factory);
 
   // Note that GetURLRequestContext() can only be called from the IO
   // thread (it will assert otherwise).
-  // GetIOMessageLoopProxy however can be called from any thread.
+  // GetIOTaskRunner however can be called from any thread.
   //
   // net::URLRequestContextGetter implementation.
   net::URLRequestContext* GetURLRequestContext() override;
   scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner()
       const override;
 
   // Create an instance for use with an 'original' (non-OTR) profile. This is
   // expected to get called on the UI thread.
   static IOSChromeURLRequestContextGetter* Create(
       const ChromeBrowserStateIOData* io_data,
@@ skipping 20 matching lines @@
   // NULL before initialization and after invalidation.
   // Otherwise, it is the URLRequestContext instance that
   // was lazily created by GetURLRequestContext().
   // Access only from the IO thread.
   net::URLRequestContext* url_request_context_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSChromeURLRequestContextGetter);
 };
 
 #endif  // IOS_CHROME_BROWSER_NET_IOS_CHROME_URL_REQUEST_CONTEXT_GETTER_H_