[packages/chromium-browser] (11 commits) ...updated to stable 28.0.1500.45

[glen]

Summary of changes:

  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 (*)
  fd8098d... up to 28.0.1500.29 (*)
  1ed01da... get nacl building (*)
  5cd76a4... up to 28.0.1500.36 (*)
  d26b6bb... up to 28.0.1500.45 (*)
  0b40b04... updated to stable 28.0.1500.45

(*) This commit already existed in another branch; no separate mail sent