Now that googletest has moved to C++11, it should no longer
use NULL or 0 for the null pointer. This patch converts all
such usages to nullptr using clang-tidy.
This prevents LLVM from issuing -Wzero-as-null-pointer-constant
warnings.
PiperOrigin-RevId: 215814400
As mentioned in issue #360:
"Now that all the platforms gtest supports work with value-parameterized
tests, we should remove the uses of the GTEST_HAS_PARAM_TESTS macro from
the codebase everywhere."
https://github.com/google/googletest/issues/360
