GitLab

Replace uses of GDataDirectory::AddEntry() with the new function in tests.
Along the way, make GDataEntry::AddEntry() private.

BUG=137725
TEST=out/Release/unit_tests --gtest_filter=GData*  && out/Release/browser_tests --gtest_filter=GData*

Review URL: https://chromiumcodereview.appspot.com/10828083

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149220 0039d316-1c4b-4281-b951-d872f2087c98