Don't try to download 'NothingToDownload' placeholder avatar.

chrome/browser/profiles/profile_avatar_icon_util.h

Index: chrome/browser/profiles/profile_avatar_icon_util.h
diff --git a/chrome/browser/profiles/profile_avatar_icon_util.h b/chrome/browser/profiles/profile_avatar_icon_util.h
index 6896f5a83ac8bf69eb8a95270613fe6c862133a9..99ca49b298054600166cd23829085cfa76f523b2 100644
--- a/chrome/browser/profiles/profile_avatar_icon_util.h
+++ b/chrome/browser/profiles/profile_avatar_icon_util.h
@@ -67,7 +67,7 @@ size_t GetDefaultAvatarIconCount();
 size_t GetGenericAvatarIconCount();
 
 // Gets the index for the (grey silhouette) avatar used as a placeholder.
-int GetPlaceholderAvatarIndex();
+size_t GetPlaceholderAvatarIndex();
 
 // Gets the resource ID of the placeholder avatar icon.
 int GetPlaceholderAvatarIconResourceID();
@@ -78,9 +78,6 @@ int GetDefaultAvatarIconResourceIDAtIndex(size_t index);
 // Gets the resource filename of the default avatar icon at |index|.
 const char* GetDefaultAvatarIconFileNameAtIndex(size_t index);
 
-// Gets the file name of an avatar that has no high res version.
-const char* GetNoHighResAvatarFileName();
-
 // Gets the full path of the high res avatar icon at |index|.
 base::FilePath GetPathOfHighResAvatarAtIndex(size_t index);