Fix crash on Linux caused by null deref

chrome/browser/ui/views/autofill/card_unmask_prompt_views.cc

 // Copyright 2014 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/views/autofill/card_unmask_prompt_views.h"
 
 #include "base/basictypes.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/autofill/autofill_dialog_types.h"
 #include "chrome/browser/ui/autofill/card_unmask_prompt_controller.h"
@@ skipping 91 matching lines @@
         IDS_AUTOFILL_CARD_UNMASK_VERIFICATION_SUCCESS));
     progress_throbber_->SetChecked(true);
     base::MessageLoop::current()->PostDelayedTask(
         FROM_HERE, base::Bind(&CardUnmaskPromptViews::ClosePrompt,
                               weak_ptr_factory_.GetWeakPtr()),
         controller_->GetSuccessMessageDuration());
   } else {
     // TODO(estade): it's somewhat jarring when the error comes back too
     // quickly.
     overlay_animation_.Reset();
-    storage_row_->SetAlpha(255);
+    if (storage_row_)
+      storage_row_->SetAlpha(255);
     progress_overlay_->SetVisible(false);
 
     if (allow_retry) {
       SetInputsEnabled(true);
 
       // If there is more than one input showing, don't mark anything as
       // invalid since we don't know the location of the problem.
       if (!controller_->ShouldRequestExpirationDate())
         cvc_input_->SetInvalid(true);
 
@@ skipping 354 matching lines @@
   views::View::OnPaint(canvas);
   canvas->Restore();
 }
 
 void CardUnmaskPromptViews::FadeOutView::SetAlpha(uint8_t alpha) {
   alpha_ = alpha;
   SchedulePaint();
 }
 
 }  // namespace autofill