Fix warnings

[hemantbits]

Fixed these warnings:

src/logging_unittest.cc: At global scope:
src/logging_unittest.cc:1081:13: warning: 'void MyCheck(bool, bool)' defined but not used [-Wunused-function]
 static void MyCheck(bool a, bool b) {
             ^~~~~~~
src/logging_unittest.cc:1078:13: warning: 'void MyFatal()' defined but not used [-Wunused-function]
 static void MyFatal() {
             ^~~~~~~

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[hemantbits]

I signed it!

[googlebot]

CLAs look good, thanks!

[sergiud]

What's the reason for keeping the functions in a comment?

[hemantbits]

I was thinking if someone might want to use them in future. If you think they should be removed, please let me know