Update archive_build.py after WebCore move
Update archive_build.py after WebCore move

WebCore no longer exists. Rather than grabbing at WebCore, we can at least look
at the Source directory.

Review URL: https://codereview.chromium.org/14312008

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@194538 0039d316-1c4b-4281-b951-d872f2087c98

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