Move ImageFetcher to its own target.

ios/chrome/browser/net/image_fetcher/image_fetcher.h

 // Copyright 2011 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_IMAGE_FETCHER_H_
-#define IOS_CHROME_BROWSER_NET_IMAGE_FETCHER_H_
+#ifndef IOS_CHROME_BROWSER_NET_IMAGE_FETCHER_IMAGE_FETCHER_H_
+#define IOS_CHROME_BROWSER_NET_IMAGE_FETCHER_IMAGE_FETCHER_H_
 
 #include <map>
 
 #include "base/mac/scoped_block.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request.h"
 
 class GURL;
 @class NSData;
 
 namespace base {
 class TaskRunner;
 }
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 // Callback that informs of the download of an image encoded in |data|,
 // downloaded from |url|, and with the http status |http_response_code|. If the
 // url is a data URL, |http_response_code| is always 200.
-using ImageFetchedCallback =
-    void (^)(const GURL& url, int http_response_code, NSData* data);
+using ImageFetchedCallback = void (^)(const GURL& url,
+                                      int http_response_code,
+                                      NSData* data);
 
 // Utility class that will retrieve an image from an URL. The image is returned
 // as NSData which can be used with +[UIImage imageWithData:]. This class
 // usually returns the raw bytes retrieved from the network without any
 // processing, with the exception of WebP encoded images. Those are decoded and
 // then reencoded in a format suitable for UIImage.
 // An instance of this class can download a number of images at the same time.
 class ImageFetcher : public net::URLFetcherDelegate {
  public:
   // The TaskRunner is used to eventually decode the image.
@@ skipping 10 matching lines @@
                              ImageFetchedCallback callback,
                              const std::string& referrer,
                              net::URLRequest::ReferrerPolicy referrer_policy);
 
   // Helper method to call StartDownload without a referrer.
   // (virtual for testing)
   virtual void StartDownload(const GURL& url, ImageFetchedCallback callback);
 
   // A valid request context getter is required before starting the download.
   // (virtual for testing)
-  virtual void SetRequestContextGetter(const scoped_refptr<
-      net::URLRequestContextGetter>& request_context_getter);
+  virtual void SetRequestContextGetter(
+      const scoped_refptr<net::URLRequestContextGetter>&
+          request_context_getter);
 
   // net::URLFetcherDelegate:
   void OnURLFetchComplete(const net::URLFetcher* source) override;
 
  private:
   // Runs the callback with the given arguments.
   void RunCallback(const base::mac::ScopedBlock<ImageFetchedCallback>& callback,
                    const GURL& url,
                    const int http_response_code,
                    NSData* data);
 
   // Tracks open download requests.  The key is the URLFetcher object doing the
   // fetch; the value is the callback to use when the download request
   // completes. When a download request completes, the URLFetcher must be
   // deleted and the callback called and released.
   std::map<const net::URLFetcher*, ImageFetchedCallback> downloads_in_progress_;
   scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
 
   // The task runner used to decode images if necessary.
   const scoped_refptr<base::TaskRunner> task_runner_;
 
   // The WeakPtrFactory is used to cancel callbacks if ImageFetcher is destroyed
   // during WebP decoding.
   base::WeakPtrFactory<ImageFetcher> weak_factory_;
 };
 
-#endif  // IOS_CHROME_BROWSER_NET_IMAGE_FETCHER_H_
+#endif  // IOS_CHROME_BROWSER_NET_IMAGE_FETCHER_IMAGE_FETCHER_H_