Fixed 2 issues with the api-checker.
(1) Api checker now propagates the errors that TypeOracle encounters.
(2) Only the translatable version of LinkedHashMap_CustomFieldSerializer is now
checked for api compatibility. 


Patch by: amitmanjhi
Review by: spoon (desk review) 



git-svn-id: https://google-web-toolkit.googlecode.com/svn/releases/1.6@4269 8db76d5a-ed1c-0410-87a9-c151d255dfc7