Turn on file access checks on Win.

chrome/browser/browser.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/browser.h"
 
 #if defined(OS_WIN)
 #include <shellapi.h>
 #include <windows.h>
 #endif  // OS_WIN
@@ skipping 358 matching lines @@
   browser->CreateBrowserWindow();
   return browser;
 }
 
 void Browser::CreateBrowserWindow() {
   DCHECK(!window_);
 
   window_ = BrowserWindow::CreateBrowserWindow(this);
 
 #if defined(OS_WIN)
-  // Set the app user model id for this application to that of the application
-  // name.  See http://crbug.com/7028.
-  win_util::SetAppIdForWindow(
-      type_ & TYPE_APP ?
-      ShellIntegration::GetAppId(UTF8ToWide(app_name_), profile_->GetPath()) :
-      ShellIntegration::GetChromiumAppId(profile_->GetPath()),
-      window()->GetNativeHandle());
+  {
+    // TODO: This might hit the disk
+    //   http://code.google.com/p/chromium/issues/detail?id=61638
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+
+    // Set the app user model id for this application to that of the application
+    // name.  See http://crbug.com/7028.
+    win_util::SetAppIdForWindow(
+        type_ & TYPE_APP ?
+        ShellIntegration::GetAppId(UTF8ToWide(app_name_), profile_->GetPath()) :
+        ShellIntegration::GetChromiumAppId(profile_->GetPath()),
+        window()->GetNativeHandle());
+  }
 #endif
 
   NotificationService::current()->Notify(
       NotificationType::BROWSER_WINDOW_READY,
       Source<Browser>(this),
       NotificationService::NoDetails());
 
   // Show the First Run information bubble if we've been told to.
   PrefService* local_state = g_browser_process->local_state();
   if (!local_state)
@@ skipping 3671 matching lines @@
   NOTREACHED();
   return false;
 }
 
 void Browser::CreateInstantIfNecessary() {
   if (type() == TYPE_NORMAL && InstantController::IsEnabled(profile()) &&
       !profile()->IsOffTheRecord()) {
     instant_.reset(new InstantController(profile_, this));
   }
 }