Revert 232602 "Disable Background Menu Items for Component Exten..."
Broke Linux valgrind bot
http://build.chromium.org/p/chromium.memory.fyi/builders/Linux%20Tests%20%28valgrind%29%285%29/builds/24031

> Disable Background Menu Items for Component Extensions without Options Pages
> 
> Component extensions with background that do not have an options page
> will cause this menu item to go to the extensions page with an
> absent component extension.
> 
> Ideally, we would remove this item, but this conflicts with the user
> model where this menu shows the extensions with background.
> 
> The compromise is to disable the item, avoiding the non-actionable
> navigate to the extensions page and preserving the user model.
> 
> BUG=311884
> TEST=From the Chrome Background Context Menu, "Google Now" should be disabled.
> Other extensions (non-component or has options page) will remain enabled.
> 
> Review URL: https://codereview.chromium.org/52553004

TBR=robliao@chromium.org

Review URL: https://codereview.chromium.org/56943002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232619 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232619