Fixes race condition that could result in a tab prematurely

chrome/browser/renderer_host/render_view_host.cc

 // Copyright (c) 2010 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/renderer_host/render_view_host.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 225 matching lines @@
   // Only send the message if we aren't suspended at the start of a cross-site
   // request.
   if (navigations_suspended_) {
     // Shouldn't be possible to have a second navigation while suspended, since
     // navigations will only be suspended during a cross-site request.  If a
     // second navigation occurs, TabContents will cancel this pending RVH
     // create a new pending RVH.
     DCHECK(!suspended_nav_message_.get());
     suspended_nav_message_.reset(nav_message);
   } else {
+    // Unset this, otherwise if true and the hang monitor fires we'll
+    // incorrectly close the tab.
+    is_waiting_for_unload_ack_ = false;
+
     Send(nav_message);
 
     // Force the throbber to start. We do this because WebKit's "started
     // loading" message will be received asynchronously from the UI of the
     // browser. But we want to keep the throbber in sync with what's happening
     // in the UI. For example, we want to start throbbing immediately when the
     // user naivgates even if the renderer is delayed. There is also an issue
     // with the throbber starting because the DOMUI (which controls whether the
     // favicon is displayed) happens synchronously. If the start loading
     // messages was asynchronous, then the default favicon would flash in.
@@ skipping 1785 matching lines @@
   RenderViewHostDelegate::ContentSettings* content_settings_delegate =
       delegate_->GetContentSettingsDelegate();
   if (content_settings_delegate)
     content_settings_delegate->OnWebDatabaseAccessed(
         url, name, display_name, estimated_size, blocked_by_policy);
 }
 
 void RenderViewHost::OnSetDisplayingPDFContent() {
   delegate_->SetDisplayingPDFContent();
 }