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

chrome/browser/ui/omnibox/omnibox_edit_model.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/omnibox/omnibox_edit_model.h"
 
 #include <string>
 
 #include "base/auto_reset.h"
 #include "base/format_macros.h"
@@ skipping 193 matching lines @@
       view_->SetInstantSuggestion(string16());
       if (!suggestion.text.empty())
         FinalizeInstantQuery(view_->GetText(), suggestion, false);
       break;
 
     case INSTANT_COMPLETE_NEVER:
       DCHECK_EQ(INSTANT_SUGGESTION_SEARCH, suggestion.type);
       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;
+    }
   }
 }
 
 bool OmniboxEditModel::CommitSuggestedText(bool skip_inline_autocomplete) {
   if (!controller_->GetInstant())
     return false;
 
   const string16 suggestion = view_->GetInstantSuggestion();
   if (suggestion.empty())
     return false;
@@ skipping 1106 matching lines @@
     instant->OmniboxFocusChanged(state, reason, NULL);
 
   // Update state and notify view if the omnibox has focus and the caret
   // visibility changed.
   const bool was_caret_visible = is_caret_visible();
   focus_state_ = state;
   if (focus_state_ != OMNIBOX_FOCUS_NONE &&
       is_caret_visible() != was_caret_visible)
     view_->ApplyCaretVisibility();
 }