remove GTEST_ARRAY_SIZE_

This macro didn't work when an array was passed to a function by pointer,
in which case the information about its size was lost.
Better alternatives are:
* std::extent<T>::value (compile-time)
* std::array<T, N>::size() (compile-time)
* std::distance(std::begin(array), std::end(array)) (run-time)

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

@@ -856,9 +856,6 @@ class Secret;
 // expression is false, compiler will issue an error containing this identifier.
 #define GTEST_COMPILE_ASSERT_(expr, msg) static_assert(expr, #msg)
 
-// Evaluates to the number of elements in 'array'.
-#define GTEST_ARRAY_SIZE_(array) (sizeof(array) / sizeof(array[0]))
-
 // A helper for suppressing warnings on constant condition.  It just
 // returns 'condition'.
 GTEST_API_ bool IsTrue(bool condition);