Ensure "Press Tab to search" is never displayed when instant extended is enabled.

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 3f224585b0cde19ce60cb9e40bf5772087c1c460..7e317aa603858620e35ab6e67a93b89038d2cfb8 100644
--- a/chrome/browser/ui/omnibox/omnibox_edit_model.cc
+++ b/chrome/browser/ui/omnibox/omnibox_edit_model.cc
@@ -211,13 +211,18 @@ void OmniboxEditModel::SetInstantSuggestion(
       view_->SetInstantSuggestion(suggestion.text);
       break;
 
-    case INSTANT_COMPLETE_REPLACE:
+    case INSTANT_COMPLETE_REPLACE: {
+      const bool save_original_selection = !has_temporary_text_;
       view_->SetInstantSuggestion(string16());
       has_temporary_text_ = true;
       is_temporary_text_set_by_instant_ = true;
-      view_->SetWindowTextAndCaretPos(suggestion.text, suggestion.text.size(),
-                                      false, false);
+      // Instant suggestions are never a keyword.
+      keyword_ = string16();
+      is_keyword_hint_ = false;
+      view_->OnTemporaryTextMaybeChanged(suggestion.text,
+                                         save_original_selection);
       break;
+    }
   }
 }