Enable gclient runhooks for build_presubmit.
Enable gclient runhooks for build_presubmit.

This will remove the stale pyc files.

BUG=500841

Review URL: https://codereview.chromium.org/1181053008

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@295719 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build