Don't use process isolation for bookmark apps.

chrome/browser/renderer_host/chrome_render_view_host_observer.cc

Index: chrome/browser/renderer_host/chrome_render_view_host_observer.cc
diff --git a/chrome/browser/renderer_host/chrome_render_view_host_observer.cc b/chrome/browser/renderer_host/chrome_render_view_host_observer.cc
index dd59ff4f6629fae7aedf16702bce1d45c71e1952..3a2713d31eae6ba2a3cde000304abc271844688c 100644
--- a/chrome/browser/renderer_host/chrome_render_view_host_observer.cc
+++ b/chrome/browser/renderer_host/chrome_render_view_host_observer.cc
@@ -133,9 +133,9 @@ void ChromeRenderViewHostObserver::InitRenderViewForExtensions() {
 }
 
 const Extension* ChromeRenderViewHostObserver::GetExtension() {
-  // Note that due to ChromeContentBrowserClient::GetEffectiveURL(), even hosted
-  // apps will have a chrome-extension:// URL for their site, so we can ignore
-  // that wrinkle here.
+  // Note that due to ChromeContentBrowserClient::GetEffectiveURL(), hosted apps
+  // (excluding bookmark apps) will have a chrome-extension:// URL for their
+  // site, so we can ignore that wrinkle here.
   SiteInstance* site_instance = render_view_host()->site_instance();
   const GURL& site = site_instance->site();