Revert "Split app.gyp and add a Win64 version of the app_base target."

This reverts r33990 due to compile failure on linux ChromeOS.

Review URL: http://codereview.chromium.org/466059

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@33992 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed