fix scons build

DerivedSources.make changed, so we need to match it's change.
http://codereview.chromium.org/21351/diff/13/15

TBR=brettw

Review URL: http://codereview.chromium.org/21356


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@9771 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed