Googletest export

Revert CL that updated example for SetUpTestSuite/TearDownTestSuite to initialize static member variables inline.

It seems that non-const static data members for some reason still must be initialized out-of-line.

PiperOrigin-RevId: 408913846

docs/advanced.md

@@ -926,9 +926,11 @@ class FooTest : public testing::Test {
   void TearDown() override { ... }
 
   // Some expensive resource shared by all tests.
-  static T* shared_resource_ = nullptr;
+  static T* shared_resource_;
 };
 
+T* FooTest::shared_resource_ = nullptr;
+
 TEST_F(FooTest, Test1) {
   ... you can refer to shared_resource_ here ...
 }