This reverts commit 6ff54485.

'fetch --nohooks chromium' is broken with this change.

BUG=

Review URL: https://codereview.chromium.org/177003023

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@253640 0039d316-1c4b-4281-b951-d872f2087c98