Don't use process isolation for bookmark apps.

chrome/common/extensions/extension_set.cc

Index: chrome/common/extensions/extension_set.cc
diff --git a/chrome/common/extensions/extension_set.cc b/chrome/common/extensions/extension_set.cc
index 105420bc9605d368c96f8fae11fa6f772e158342..9a716855b0632d7447798d994027cbce4c5a962d 100644
--- a/chrome/common/extensions/extension_set.cc
+++ b/chrome/common/extensions/extension_set.cc
@@ -46,8 +46,12 @@ const Extension* ExtensionSet::GetByURL(const GURL& url) const {
 
   ExtensionMap::const_iterator i = extensions_.begin();
   for (; i != extensions_.end(); ++i) {
-    if (i->second->web_extent().MatchesURL(url))
+    // Exclude bookmark apps so that they do not affect the process model.
+    // TODO(creis): Where is the right place to do this exclusion?
+    if (i->second->web_extent().MatchesURL(url) &&
+        !i->second->from_bookmark()) {
       return i->second.get();
+    }
   }
 
   return NULL;