linux: remove split base_extra_target from base.gyp

Previously we built part of base twice under different configurations.  This reverts r49502 (http://codereview.chromium.org/2796002), since we don't need a separate fpic base target now that all of Linux is built with fpic.
Review URL: http://codereview.chromium.org/5361011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@67893 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed