Eliminate symbol visibility warnings produced when linking a unit test target against libgtest.  Make a few other changes to gtest.xcodeproj to bring it in line with the rest of our project files.
Eliminate symbol visibility warnings produced when linking a unit test target against libgtest.  Make a few other changes to gtest.xcodeproj to bring it in line with the rest of our project files.

git-svn-id: http://src.chromium.org/svn/trunk/src@715 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 51b915a225b750f4cccfb5f763a4369f5f18cd2f
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