Fix DCHECK.

components/omnibox/browser/omnibox_controller.cc

 // Copyright 2013 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 "components/omnibox/browser/omnibox_controller.h"
 
 #include "base/metrics/histogram.h"
 #include "components/omnibox/browser/autocomplete_classifier.h"
 #include "components/omnibox/browser/autocomplete_match.h"
 #include "components/omnibox/browser/omnibox_client.h"
@@ skipping 22 matching lines @@
     const AutocompleteInput& input) const {
   ClearPopupKeywordMode();
   popup_->SetHoveredLine(OmniboxPopupModel::kNoMatch);
 
   // We don't explicitly clear OmniboxPopupModel::manually_selected_match, as
   // Start ends up invoking OmniboxPopupModel::OnResultChanged which clears it.
   autocomplete_controller_->Start(input);
 }
 
 void OmniboxController::OnResultChanged(bool default_match_changed) {
-  const bool was_open = popup_->IsOpen();
+  const bool was_open = popup_ && popup_->IsOpen();
   if (default_match_changed) {
     // The default match has changed, we need to let the OmniboxEditModel know
     // about new inline autocomplete text (blue highlight).
     const AutocompleteResult::const_iterator match(result().default_match());
     if (match != result().end()) {
       current_match_ = *match;
       omnibox_edit_model_->OnCurrentMatchChanged();
     } else {
       InvalidateCurrentMatch();
-      popup_->OnResultChanged();
+      if (popup_)
+        popup_->OnResultChanged();
       omnibox_edit_model_->OnPopupDataChanged(base::string16(), nullptr,
                                               base::string16(), false);
     }
-  } else {
+  } else if (popup_) {
     popup_->OnResultChanged();
   }
 
-  if (!popup_->IsOpen() && was_open) {
+  if (was_open && !popup_->IsOpen()) {
     // Accept the temporary text as the user text, because it makes little sense
     // to have temporary text when the popup is closed.
     omnibox_edit_model_->AcceptTemporaryTextAsUserText();
   }
 
   // Note: The client outlives |this|, so bind a weak pointer to the callback
   // passed in to eliminate the potential for crashes on shutdown.
   client_->OnResultChanged(result(), default_match_changed,
                            base::Bind(&OmniboxController::SetAnswerBitmap,
                                       weak_ptr_factory_.GetWeakPtr()));
 }
 
 void OmniboxController::InvalidateCurrentMatch() {
   current_match_ = AutocompleteMatch();
 }
 
 void OmniboxController::ClearPopupKeywordMode() const {
   if (popup_->IsOpen() &&
       popup_->selected_line_state() == OmniboxPopupModel::KEYWORD)
     popup_->SetSelectedLineState(OmniboxPopupModel::NORMAL);
 }
 
 void OmniboxController::SetAnswerBitmap(const SkBitmap& bitmap) {
   popup_->SetAnswerBitmap(bitmap);
 }