Remove unused instant support for chrome://large-icon and chrome://fallback-icon

chrome/renderer/searchbox/searchbox.h

Index: chrome/renderer/searchbox/searchbox.h
diff --git a/chrome/renderer/searchbox/searchbox.h b/chrome/renderer/searchbox/searchbox.h
index 9172ad4c253b337eb4a2dc5a361704cabc5b6b88..40679545ec8f6958a4d42e5c517607473f5e04b7 100644
--- a/chrome/renderer/searchbox/searchbox.h
+++ b/chrome/renderer/searchbox/searchbox.h
@@ -30,8 +30,6 @@ class SearchBox : public content::RenderFrameObserver,
   enum ImageSourceType {
     NONE = -1,
     FAVICON,
-    LARGE_ICON,
-    FALLBACK_ICON,
     THUMB
   };
 
@@ -77,18 +75,11 @@ class SearchBox : public content::RenderFrameObserver,
   // |transient_url|. If |transient_url| is valid, |url| with a translated URL
   // and returns true.  Otherwise it depends on |type|:
   // - FAVICON: Returns true and renders an URL to display the default favicon.
-  // - LARGE_ICON and FALLBACK_ICON: Returns false.
   //
   // For |type| == FAVICON, valid forms of |transient_url|:
   //    chrome-search://favicon/<view_id>/<restricted_id>
   //    chrome-search://favicon/<favicon_parameters>/<view_id>/<restricted_id>
   //
-  // For |type| == LARGE_ICON, valid form of |transient_url|:
-  //    chrome-search://large-icon/<size>/<view_id>/<restricted_id>
-  //
-  // For |type| == FALLBACK_ICON, valid form of |transient_url|:
-  //    chrome-search://fallback-icon/<icon specs>/<view_id>/<restricted_id>
-  //
   // For |type| == THUMB, valid form of |transient_url|:
   //    chrome-search://thumb/<render_view_id>/<most_visited_item_id>
   //