iOS gtest launcher: make simple unit tests like base_unittests work

base/test/gtest_util.cc

Index: base/test/gtest_util.cc
diff --git a/base/test/gtest_util.cc b/base/test/gtest_util.cc
index f98320c52746e063f92d16ba178167b9faefeeaa..c0bc04a629a842ecb29b7ddebe4bfdb8091101dd 100644
--- a/base/test/gtest_util.cc
+++ b/base/test/gtest_util.cc
@@ -11,6 +11,11 @@
 
 namespace base {
 
+std::string FormatFullTestName(const std::string& test_case_name,
+                               const std::string& test_name) {
+  return test_case_name + "." + test_name;
+}
+
 std::vector<SplitTestName> GetCompiledInTests() {
   testing::UnitTest* const unit_test = testing::UnitTest::GetInstance();