Move ImageFetcher to its own target.

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

Index: ios/chrome/browser/net/image_fetcher/mock_image_fetcher.h
diff --git a/ios/chrome/browser/net/mock_image_fetcher.h b/ios/chrome/browser/net/image_fetcher/mock_image_fetcher.h
similarity index 78%
copy from ios/chrome/browser/net/mock_image_fetcher.h
copy to ios/chrome/browser/net/image_fetcher/mock_image_fetcher.h
index 259eda6229f2e8349f0ede6b7092d1b50199de48..d36aeecd54bae47b91e2782b5b424efa12995aea 100644
--- a/ios/chrome/browser/net/mock_image_fetcher.h
+++ b/ios/chrome/browser/net/image_fetcher/mock_image_fetcher.h
@@ -2,10 +2,10 @@
 // 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_MOCK_IMAGE_FETCHER_H_
-#define IOS_CHROME_BROWSER_NET_MOCK_IMAGE_FETCHER_H_
+#ifndef IOS_CHROME_BROWSER_NET_IMAGE_FETCHER_MOCK_IMAGE_FETCHER_H_
+#define IOS_CHROME_BROWSER_NET_IMAGE_FETCHER_MOCK_IMAGE_FETCHER_H_
 
-#import "ios/chrome/browser/net/image_fetcher.h"
+#import "ios/chrome/browser/net/image_fetcher/image_fetcher.h"
 
 #include "testing/gmock/include/gmock/gmock.h"
 
@@ -28,4 +28,4 @@ class MockImageFetcher : public ImageFetcher {
                         request_context_getter));
 };
 
-#endif  // IOS_CHROME_BROWSER_NET_MOCK_IMAGE_FETCHER_H_
+#endif  // IOS_CHROME_BROWSER_NET_IMAGE_FETCHER_MOCK_IMAGE_FETCHER_H_