Move ImageFetcher to its own target.

ios/chrome/browser/suggestions/image_fetcher_impl.h

Index: ios/chrome/browser/suggestions/image_fetcher_impl.h
diff --git a/ios/chrome/browser/suggestions/image_fetcher_impl.h b/ios/chrome/browser/suggestions/image_fetcher_impl.h
index a6902d586751e1f1396cfbd72a326f4dc709dc65..90065cf67a1f59925c84221277bdbfe5116fdb11 100644
--- a/ios/chrome/browser/suggestions/image_fetcher_impl.h
+++ b/ios/chrome/browser/suggestions/image_fetcher_impl.h
@@ -13,7 +13,6 @@
 #include "components/image_fetcher/image_fetcher.h"
 
 class GURL;
-class ImageFetcher;
 
 namespace base {
 class SequencedWorkerPool;
@@ -25,6 +24,7 @@ class Image;
 
 namespace image_fetcher {
 class ImageFetcherDelegate;
+class RawImageFetcher;
 }
 
 namespace net {
@@ -52,7 +52,7 @@ class ImageFetcherImpl : public image_fetcher::ImageFetcher {
       override;
 
  private:
-  std::unique_ptr<::ImageFetcher> imageFetcher_;
+  std::unique_ptr<image_fetcher::RawImageFetcher> imageFetcher_;
 
   image_fetcher::ImageFetcherDelegate* delegate_;