Update merge_from_chromium.py after Chromium Git migration.

Chromium has switched to Git. SVN is not the source of truth anymore.
The following change removes --svn support from merge_from_chromium.py
and makes it understand git.
Also, this is removing the --lkgr option, as LKGR is being deprecated
in chromium.

Change-Id: I879e9cda2cee313f1e2409a1a85b173db59efd8c
(cherry picked from commit 753233e1666d4a8f69a4fae4345f9590f19589ef)
1 file changed
tree: b6eaf4f9cc7d9cc9aa04661beb2dfdb64673bac3
  1. Android.mk
  2. chromium/
  3. nullwebview/