Style cleanup.

1) Convert iterator-based for loops to C++11 foreach loops.
2) Convert "void operator=" to "T& operator=".
3) Switch from copy operators from private to public deleted.
4) Switch from empty ctors / dtors to "= default" where appropriate.

PiperOrigin-RevId: 246679195

table/two_level_iterator.cc

@@ -77,7 +77,7 @@ TwoLevelIterator::TwoLevelIterator(Iterator* index_iter,
       index_iter_(index_iter),
       data_iter_(nullptr) {}
 
-TwoLevelIterator::~TwoLevelIterator() {}
+TwoLevelIterator::~TwoLevelIterator() = default;
 
 void TwoLevelIterator::Seek(const Slice& target) {
   index_iter_.Seek(target);