[packages/chromium-browser] (6 commits) Created branch dev-28

[glen]

The branch 'dev-28' was created.

Summary of new commits:

  e63ffea... get-source: avoid making diff if previous version is same
  7879021... up to 28.0.1500.20
  517dd8e... clean-source: attempt to preserve third_party/zlib/google
  7e634b4... use system snappy
  e7285c2... update libXNVCtrl.h path
  9245150... updated system-libxnvctrl.patch to use shim headers