Don't use process isolation for bookmark apps.

chrome/browser/chrome_content_browser_client.cc

 // Copyright (c) 2011 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/chrome_content_browser_client.h"
 
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 336 matching lines @@
   // extension as the host. This has the effect of grouping apps together in
   // a common SiteInstance.
   if (!profile || !profile->GetExtensionService())
     return url;
 
   const Extension* extension =
       profile->GetExtensionService()->GetExtensionByWebExtent(url);
   if (!extension)
     return url;
 
+  // Bookmark apps do not use the hosted app process model, and should be
+  // treated as normal URLs.
+  if (extension->from_bookmark())
+    return url;
+
   // If the URL is part of an extension's web extent, convert it to an
   // extension URL.
   return extension->GetResourceURL(url.path());
 }
 
 bool ChromeContentBrowserClient::ShouldUseProcessPerSite(
     content::BrowserContext* browser_context, const GURL& effective_url) {
   // Non-extension URLs should generally use process-per-site-instance.
-  // Because we expect to use the effective URL, hosted apps URLs should have
-  // an extension scheme by now.
+  // Because we expect to use the effective URL, URLs for hosted apps (apart
+  // from bookmark apps) should have an extension scheme by now.
   if (!effective_url.SchemeIs(chrome::kExtensionScheme))
     return false;
 
   Profile* profile = Profile::FromBrowserContext(browser_context);
   if (!profile || !profile->GetExtensionService())
     return false;
 
   const Extension* extension =
       profile->GetExtensionService()->GetExtensionByURL(effective_url);
   if (!extension)
@@ skipping 753 matching lines @@
 #if defined(USE_NSS)
 crypto::CryptoModuleBlockingPasswordDelegate*
     ChromeContentBrowserClient::GetCryptoPasswordDelegate(
         const GURL& url) {
   return browser::NewCryptoModuleBlockingDialogDelegate(
       browser::kCryptoModulePasswordKeygen, url.host());
 }
 #endif
 
 }  // namespace chrome