Add ByMove() modifier for the Return() action.

include/gtest/internal/gtest-port.h

@@ -206,7 +206,7 @@
 //
 // C++11 feature wrappers:
 //
-//   GTEST_MOVE_          - portability wrapper for std::move.
+//   testing::internal::move  - portability wrapper for std::move.
 //
 // Synchronization:
 //   Mutex, MutexLock, ThreadLocal, GetThreadCount()
@@ -905,12 +905,6 @@ using ::std::tuple_size;
 # define GTEST_MUST_USE_RESULT_
 #endif  // __GNUC__ && (GTEST_GCC_VER_ >= 30400) && !COMPILER_ICC
 
-#if GTEST_HAS_STD_MOVE_
-# define GTEST_MOVE_(x) ::std::move(x)  // NOLINT
-#else
-# define GTEST_MOVE_(x) x
-#endif
-
 // MS C++ compiler emits warning when a conditional expression is compile time
 // constant. In some contexts this warning is false positive and needs to be
 // suppressed. Use the following two macros in such cases:
@@ -1323,6 +1317,15 @@ inline void FlushInfoLog() { fflush(NULL); }
     GTEST_LOG_(FATAL) << #posix_call << "failed with error " \
                       << gtest_error
 
+#if GTEST_HAS_STD_MOVE_
+using std::move;
+#else  // GTEST_LANG_CXX11
+template <typename T>
+const T& move(const T& t) {
+  return t;
+}
+#endif  // GTEST_HAS_STD_MOVE_
+
 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 //
 // Use ImplicitCast_ as a safe version of static_cast for upcasting in
@@ -1344,7 +1347,7 @@ inline void FlushInfoLog() { fflush(NULL); }
 // similar functions users may have (e.g., implicit_cast). The internal
 // namespace alone is not enough because the function can be found by ADL.
 template<typename To>
-inline To ImplicitCast_(To x) { return x; }
+inline To ImplicitCast_(To x) { return move(x); }
 
 // When you upcast (that is, cast a pointer from type Foo to type
 // SuperclassOfFoo), it's fine to use ImplicitCast_<>, since upcasts