Move WasUnableToDownload logic to FaviconHandler

components/favicon/core/favicon_handler.h

Index: components/favicon/core/favicon_handler.h
diff --git a/components/favicon/core/favicon_handler.h b/components/favicon/core/favicon_handler.h
index e7a13bbb8d08a03166d910ab0330d170854c488b..d15332d5592c9b48613ff4a1341d8f3a0b62749f 100644
--- a/components/favicon/core/favicon_handler.h
+++ b/components/favicon/core/favicon_handler.h
@@ -219,6 +219,10 @@ class FaviconHandler {
   void OnFaviconDataForInitialURLFromFaviconService(const std::vector<
       favicon_base::FaviconRawBitmapResult>& favicon_bitmap_results);
 
+  // Increments |current_candidate_index_| if a next candidate is available,
+  // returns false otherwise.
+  bool IncrementCurrentCandidateIndex();
+
   // If the favicon currently mapped to |url_| has expired, downloads the
   // current candidate favicon from the renderer. Otherwise requests data for
   // the current favicon from history. If data is requested from history,