Googletest export

Removing GTEST_API from TrueWithString.
This type is only used in test code on one side of a DLL boundary so it is not
necessary.

PiperOrigin-RevId: 288927929

googletest/include/gtest/internal/gtest-internal.h

@@ -844,7 +844,7 @@ struct GTEST_API_ ConstCharPtr {
 
 // Helper for declaring std::string within 'if' statement
 // in pre C++17 build environment.
-struct GTEST_API_ TrueWithString {
+struct TrueWithString {
   TrueWithString() = default;
   explicit TrueWithString(const char* str) : value(str) {}
   explicit TrueWithString(const std::string& str) : value(str) {}