Fix manifest_to_hash.bat
Fix manifest_to_hash.bat

Call manifest_to_hash.py instead of calling self, and remove extra \ that was causing invalid escaping.

TBR=maruel@chromium.org
BUG=

Review URL: https://codereview.chromium.org/11026002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@159506 0039d316-1c4b-4281-b951-d872f2087c98

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