Add general options page. Options are working with the following exceptions:

Add general options page.  Options are working with the following exceptions:
Custom start urls and default search options widgets aren't hooked up.
Home page settings work, but are overridden by the linux start page settings.
Default browser checking/setting functions are not implemented, so the option
isn't useful yet.
  
Refactors some common code out of browser/views/options/options_page_view.*
into browser/options_page_base.{cc,h}

BUG=11507
Patch by Matt Mueller (mattm@google.com).