Use the extension icon for extension omnibox results instead of the generic

chrome/browser/cocoa/location_bar/selected_keyword_decoration.mm

Index: chrome/browser/cocoa/location_bar/selected_keyword_decoration.mm
diff --git a/chrome/browser/cocoa/location_bar/selected_keyword_decoration.mm b/chrome/browser/cocoa/location_bar/selected_keyword_decoration.mm
index ebb62bf83c5dc61f1581b7af1f3a7ec15e36d338..3c593ac9358d077903ea75d848d7bc3dadb97a3e 100644
--- a/chrome/browser/cocoa/location_bar/selected_keyword_decoration.mm
+++ b/chrome/browser/cocoa/location_bar/selected_keyword_decoration.mm
@@ -30,12 +30,12 @@ CGFloat SelectedKeywordDecoration::GetWidthForSpace(CGFloat width) {
   const CGFloat full_width =
       GetWidthForImageAndLabel(search_image_, full_string_);
   if (full_width <= width) {
-    SetImage(search_image_);
+    BubbleDecoration::SetImage(search_image_);
     SetLabel(full_string_);
     return full_width;
   }
 
-  SetImage(nil);
+  BubbleDecoration::SetImage(nil);
   const CGFloat no_image_width = GetWidthForImageAndLabel(nil, full_string_);
   if (no_image_width <= width || !partial_string_) {
     SetLabel(full_string_);
@@ -65,3 +65,9 @@ void SelectedKeywordDecoration::SetKeyword(const std::wstring& short_name,
         [l10n_util::GetNSStringF(message_id, WideToUTF16(min_name)) copy]);
   }
 }
+
+void SelectedKeywordDecoration::SetImage(NSImage* image) {
+  if (image != search_image_)
+    search_image_.reset([image retain]);
+  BubbleDecoration::SetImage(image);
+}