Don't call AcceptCurrentInstantPreview() when the user hits Tab.

chrome/browser/ui/omnibox/omnibox_edit_model.cc

Index: chrome/browser/ui/omnibox/omnibox_edit_model.cc
diff --git a/chrome/browser/ui/omnibox/omnibox_edit_model.cc b/chrome/browser/ui/omnibox/omnibox_edit_model.cc
index f66433c000d47046d8a1de3fe7b643977e675ab8..b6714607110f685841f06c735d72e0b75c06a513 100644
--- a/chrome/browser/ui/omnibox/omnibox_edit_model.cc
+++ b/chrome/browser/ui/omnibox/omnibox_edit_model.cc
@@ -267,11 +267,6 @@ bool OmniboxEditModel::CommitSuggestedText(bool skip_inline_autocomplete) {
   return true;
 }
 
-bool OmniboxEditModel::AcceptCurrentInstantPreview() {
-  return controller_->GetInstant() &&
-      controller_->GetInstant()->CommitIfPossible(INSTANT_COMMIT_PRESSED_ENTER);
-}
-
 void OmniboxEditModel::OnChanged() {
   // Don't call CurrentMatch() when there's no editing, as in this case we'll
   // never actually use it.  This avoids running the autocomplete providers (and