Change the ntp_snippet_service to use a gfx image instead of SkBitmap.

components/ntp_snippets/ntp_snippets_service.cc

Index: components/ntp_snippets/ntp_snippets_service.cc
diff --git a/components/ntp_snippets/ntp_snippets_service.cc b/components/ntp_snippets/ntp_snippets_service.cc
index ac45e1536e20311d133ebabfdf07818253dba598..1e48da9fafce28240434524ed971ae44774097fb 100644
--- a/components/ntp_snippets/ntp_snippets_service.cc
+++ b/components/ntp_snippets/ntp_snippets_service.cc
@@ -149,10 +149,7 @@ void WrapImageFetchedCallback(
     const NTPSnippetsService::ImageFetchedCallback& callback,
     const GURL& snippet_id_url,
     const gfx::Image& image) {
-  const SkBitmap* bitmap = nullptr;
-  if (!image.IsEmpty())
-    bitmap = image.ToSkBitmap();
-  callback.Run(snippet_id_url.spec(), bitmap);
+  callback.Run(snippet_id_url.spec(), image);
 }
 
 }  // namespace
@@ -248,7 +245,8 @@ void NTPSnippetsService::FetchSnippetImage(
                      return snippet->id() == snippet_id;
                    });
   if (it == snippets_.end()) {
-    callback.Run(snippet_id, nullptr);
+    gfx::Image empty_image;
+    callback.Run(snippet_id, empty_image);
     return;
   }