Sync TODO and comment processing with external repo.

Copybara transforms code slightly different than MOE. One
example is the TODO username stripping where Copybara
produces different results than MOE did. This change
moves the Copybara versions of comments to the public
repository.

Note: These changes didn't originate in cl/247950252.

PiperOrigin-RevId: 247950252

snappy_unittest.cc

@@ -29,7 +29,6 @@
 #include <math.h>
 #include <stdlib.h>
 
-
 #include <algorithm>
 #include <random>
 #include <string>
@@ -523,7 +522,6 @@ static int Verify(const string& input) {
   return result;
 }
 
-
 static bool IsValidCompressedBuffer(const string& c) {
   return snappy::IsValidCompressedBuffer(c.data(), c.size());
 }