Revert git-1.9.0.
Revert git-1.9.0.

I've received a few reports of:

error: inflate: data stream error (incorrect header check)
fatal: serious inflate inconsistency
fatal: index-pack failed
error: Could not fetch origin

TBR=mmoss@chromium.org
BUG=

Review URL: https://codereview.chromium.org/205443003

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@258147 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools