am 31f8d506: AI 148879: Update SignatureTest with many fixes. - Update SignatureTest to build against SDK - Provides better error messages on failures - Fixes issue with final methods in final classes (http://b/1839589) - Fixes issue with strict checking on native modifier (http://b/1839558) - Fixes issue with removal of abstract modifier on a class (http://b/1839622) BUG=1839558,1839622,1839589
Merge commit '31f8d5069ecf4ecd3318eeb0875a42d2942548c2' into donut
* commit '31f8d5069ecf4ecd3318eeb0875a42d2942548c2':
AI 148879: Update SignatureTest with many fixes.