Move ImageFetcher to its own target.

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

Index: ios/chrome/browser/net/image_fetcher/image_fetcher.h
diff --git a/ios/chrome/browser/net/image_fetcher.h b/ios/chrome/browser/net/image_fetcher/image_fetcher.h
similarity index 87%
copy from ios/chrome/browser/net/image_fetcher.h
copy to ios/chrome/browser/net/image_fetcher/image_fetcher.h
index 1f320772249586fb34ffa31c85d5f9354538890f..1662a312feb0e70723775047c971722303e3aa18 100644
--- a/ios/chrome/browser/net/image_fetcher.h
+++ b/ios/chrome/browser/net/image_fetcher/image_fetcher.h
@@ -2,8 +2,8 @@
 // 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>
 
@@ -27,8 +27,9 @@ 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
@@ -59,8 +60,9 @@ class ImageFetcher : public net::URLFetcherDelegate {
 
   // 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;
@@ -87,4 +89,4 @@ class ImageFetcher : public net::URLFetcherDelegate {
   base::WeakPtrFactory<ImageFetcher> weak_factory_;
 };
 
-#endif  // IOS_CHROME_BROWSER_NET_IMAGE_FETCHER_H_
+#endif  // IOS_CHROME_BROWSER_NET_IMAGE_FETCHER_IMAGE_FETCHER_H_