Initialize renderer color preferences to reasonable defaults.

BUG=158422
TEST=as in bug


Review URL: https://chromiumcodereview.appspot.com/11365096

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@166146 0039d316-1c4b-4281-b951-d872f2087c98
void Shell::PlatformCleanUp() {
}

void Shell::PlatformCleanUp() {
}
