Change webkit.gyp to pull in test_shell on all platforms.
Change webkit.gyp to pull in test_shell on all platforms.

This way the mac webkit builders can be changed to build webkit.xcodeproj
instead of test_shell.xcodeproj (as is the case for windows).

R=mark
BUG=none
TEST=none

Review URL: http://codereview.chromium.org/549059

git-svn-id: http://src.chromium.org/svn/trunk/src@36333 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 683e019f2799fd3bfec7e14040049fcbd7f98eed
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser