fix scons webkit build on windows
I added a new dependency to base and it was needed by
targets build on windows (but not yet on linux).

tbr=sgk

Review URL: http://codereview.chromium.org/10868

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@5333 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed