Add confidence to AutocompleteMatch.

chrome/browser/autocomplete/extension_app_provider.cc

Index: chrome/browser/autocomplete/extension_app_provider.cc
diff --git a/chrome/browser/autocomplete/extension_app_provider.cc b/chrome/browser/autocomplete/extension_app_provider.cc
index 0a68e8c96add51216b46c79cbf6edbde6663a370..8fef3a5391337543e92a1bfcd0952a4c68f3637b 100644
--- a/chrome/browser/autocomplete/extension_app_provider.cc
+++ b/chrome/browser/autocomplete/extension_app_provider.cc
@@ -56,7 +56,11 @@ void ExtensionAppProvider::Start(const AutocompleteInput& input,
         // We have a match, might be a partial match.
         // TODO(finnur): Figure out what type to return here, might want to have
         // the extension icon/a generic icon show up in the Omnibox.
-        AutocompleteMatch match(this, 0, false,
+        // TODO(dominich): Confidence would require us to create a match set and
+        // then iterate over to create the AutocompleteMatch objects. Currently
+        // confidence is used for instant/prerender/DNS preconnect and we may
+        // not want to do those for extension apps anyway.
+        AutocompleteMatch match(this, 0, 0.0f, false,
                                 AutocompleteMatch::EXTENSION_APP);
         match.fill_into_edit = url;
         match.destination_url = GURL(url);