D:\src\chromium\src>git pull --rebase
remote: Counting objects: 93790, done
remote: Finding sources: 100% (3116/3116)
emote: Total 3116 (delta 2234), reused 3071 (delta 2234)
Receiving objects: 100% (3116/3116), 1.76 MiB | 0 bytes/s, done.
Resolving deltas: 100% (2234/2234), completed with 942 local objects.
   db47ab2..aec5319  master     -> origin/master
   0e52e25..fb19e5d  git-svn    -> origin/git-svn
   8c50287..2d40c4e  lkgr       -> origin/lkgr
   3106537..18e3401  refs/branch-heads/1847 -> branch-heads/1847
    5b6d2f2..e88256d  refs/branch-heads/1916 -> branch-heads/1916
 * [new ref]         refs/branch-heads/1923 -> branch-heads/1923
 * [new ref]         refs/branch-heads/1924 -> branch-heads/1924
Auto packing the repository for optimum performance. You may also
run "git gc" manually. See "git help gc" for more information.
Counting objects: 2934290, done.
Compressing objects: 100% (633958/633958), done.
Writing objects: 100% (2934290/2934290), done.
Total 2934290 (delta 2375318), reused 2778401 (delta 2226694)
Unlink of file '.git/objects/pack/pack-01da6782e50c8fc97a0a3e47fcad6c8d20297f02.pack' failed. Should I try again? (y/n) y
Unlink of file '.git/objects/pack/pack-01da6782e50c8fc97a0a3e47fcad6c8d20297f02.pack' failed. Should I try again? (y/n) y
Unlink of file '.git/objects/pack/pack-01da6782e50c8fc97a0a3e47fcad6c8d20297f02.pack' failed. Should I try again? (y/n) n
Unlink of file '.git/objects/pack/pack-01da6782e50c8fc97a0a3e47fcad6c8d20297f02.idx' failed. Should I try again? (y/n) n
Unlink of file '.git/objects/pack/pack-08937321d45cc2750293863640da71983e5951ef.idx' failed. Should I try again? (y/n) n
Unlink of file '.git/objects/pack/pack-08c348feb3cf3c243cc39336bc120354d64ba641.pack' failed. Should I try again? (y/n) n
Unlink of file '.git/objects/pack/pack-08c348feb3cf3c243cc39336bc120354d64ba641.idx' failed. Should I try again? (y/n) n
Unlink of file '.git/objects/pack/pack-0ca0ed4c3a574582df1b39ed1e368b96f2a6845b.idx' failed. Should I try again? (y/n) n
Unlink of file '.git/objects/pack/pack-12a257ebf2d44fc62ac8706d0bb14ed71e5a478e.idx' failed. Should I try again? (y/n) n
Unlink of file '.git/objects/pack/pack-1a4a224d67bfb7cc2876ab3e1ef95e46e60118f1.pack' failed. Should I try again? (y/n) n
Unlink of file '.git/objects/pack/pack-1a4a224d67bfb7cc2876ab3e1ef95e46e60118f1.idx' failed. Should I try again? (y/n) n
Unlink of file '.git/objects/pack/pack-1c97e91af4c5325c3d80772719555ea67cd85606.idx' failed. Should I try again? (y/n)
Not sure how long this is going to continue on for or what the implications are if I keep hitting no.  But, does anyone know what's going on here?  I've never actually seen the "Auto packing repository" line before, so that's new as well.  Maybe somehow related?
Sadly I haven't been able to get a clean build for 2 days due to git errors, so this is starting to become rather frustrating.