PdbCrawler: Cleanup and consistency fix Added more comments and consistent naming.
PdbCrawler: Cleanup and consistency fix
Added more comments and consistent naming.

BUG=
R=manzagop@chromium.org, siggi@chromium.org

Review URL: https://codereview.chromium.org/1311783006.

google/syzygy,Eloston/syzygy,supriyantomaftuh/syzygy,supriyantomaftuh/syzygy,supriyantomaftuh/syzygy,supriyantomaftuh/syzygy,google/syzygy,google/syzygy,google/syzygy,Eloston/syzygy