Fix crasher with SSL interstitial

chrome/browser/tab_contents/interstitial_page.cc

 // Copyright (c) 2006-2008 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/tab_contents/interstitial_page.h"
 
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
 #include "base/thread.h"
 #include "chrome/browser/browser.h"
@@ skipping 115 matching lines @@
 
 InterstitialPage::~InterstitialPage() {
   InterstitialPageMap::iterator iter = tab_to_interstitial_page_->find(tab_);
   DCHECK(iter != tab_to_interstitial_page_->end());
   tab_to_interstitial_page_->erase(iter);
   DCHECK(!render_view_host_);
 }
 
 void InterstitialPage::Show() {
   // If an interstitial is already showing, close it before showing the new one.
-  if (tab_->interstitial_page())
-    tab_->interstitial_page()->DontProceed();
+  // Be careful not to take an action on the old interstitial more than once.
+  if (tab_->interstitial_page()) {
+    if (tab_->interstitial_page()->action_taken())
+      tab_->interstitial_page()->Hide();
+    else
+      tab_->interstitial_page()->DontProceed();
+  }
 
   // Block the resource requests for the render view host while it is hidden.
   TakeActionOnResourceDispatcher(BLOCK);
   // We need to be notified when the RenderViewHost is destroyed so we can
   // cancel the blocked requests.  We cannot do that on
   // NOTIFY_TAB_CONTENTS_DESTROYED as at that point the RenderViewHost has
   // already been destroyed.
   notification_registrar_.Add(
       this, NotificationType::RENDER_WIDGET_HOST_DESTROYED,
       Source<RenderWidgetHost>(tab_->render_view_host()));
@@ skipping 334 matching lines @@
 void InterstitialPage::InterstitialPageRVHViewDelegate::HandleKeyboardEvent(
     const NativeWebKeyboardEvent& event) {
   if (interstitial_page_->tab() && interstitial_page_->tab()->GetViewDelegate())
     interstitial_page_->tab()->GetViewDelegate()->HandleKeyboardEvent(event);
 }
 
 void InterstitialPage::InterstitialPageRVHViewDelegate::OnFindReply(
     int request_id, int number_of_matches, const gfx::Rect& selection_rect,
     int active_match_ordinal, bool final_update) {
 }