Move ImageFetcher to its own target.

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

Index: ios/chrome/browser/net/image_fetcher/mock_image_fetcher.mm
diff --git a/ios/chrome/browser/net/mock_image_fetcher.mm b/ios/chrome/browser/net/image_fetcher/mock_image_fetcher.mm
similarity index 64%
rename from ios/chrome/browser/net/mock_image_fetcher.mm
rename to ios/chrome/browser/net/image_fetcher/mock_image_fetcher.mm
index 7b02b8c8bea7908019e760fdb49d3a5212be2603..86dad6d1263066a9da22524a7d0d30ec9e1ea3f2 100644
--- a/ios/chrome/browser/net/mock_image_fetcher.mm
+++ b/ios/chrome/browser/net/image_fetcher/mock_image_fetcher.mm
@@ -2,12 +2,10 @@
 // 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/mock_image_fetcher.h"
+#import "ios/chrome/browser/net/image_fetcher/mock_image_fetcher.h"
 
 MockImageFetcher::MockImageFetcher(
     const scoped_refptr<base::TaskRunner>& task_runner)
-    : ImageFetcher(task_runner) {
-}
+    : ImageFetcher(task_runner) {}
 
-MockImageFetcher::~MockImageFetcher() {
-}
+MockImageFetcher::~MockImageFetcher() {}