Don't use process isolation for bookmark apps.

chrome/common/extensions/extension_set.h

 // 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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_SET_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_SET_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 34 matching lines @@
 
   // Returns the extension ID that the given URL is a part of, or empty if
   // none. This includes web URLs that are part of an extension's web extent.
   std::string GetIdByURL(const GURL& url) const;
 
   // Returns the Extension that the given URL is a part of, or NULL if none.
   // This includes web URLs that are part of an extension's web extent.
   // NOTE: This can return NULL if called before UpdateExtensions receives
   // bulk extension data (e.g. if called from
   // EventBindings::HandleContextCreated)
+  // We exclude bookmark apps.  TODO(creis): Should they be excluded from the
+  // whole set in the first place?
   const Extension* GetByURL(const GURL& url) const;
 
   // Returns true if |new_url| is in the extent of the same extension as
   // |old_url|.  Also returns true if neither URL is in an app.
   bool InSameExtent(const GURL& old_url, const GURL& new_url) const;
 
   // Look up an Extension object by id.
   const Extension* GetByID(const std::string& id) const;
 
   // Returns true if |url| should get extension api bindings and be permitted
   // to make api calls. Note that this is independent of what extension
   // permissions the given extension has been granted.
   bool ExtensionBindingsAllowed(const GURL& url) const;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ExtensionSetTest, ExtensionSet);
 
   ExtensionMap extensions_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionSet);
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_SET_H_