Remove old header-abi-dumper NDK ABI dumps.

We've got STG based ABI dumps now, and keeping both is just annoying.

Bug: None
Test: treehugger
Merged-In: I92280d31f14b8605719272b1fd7cabc1e835aa55
Change-Id: I92280d31f14b8605719272b1fd7cabc1e835aa55
312 files changed