#### NOTE: I'm opening a separate issue to #1005 because this is a separate regression - in ^4.0.0, this still worked.

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### Issue Details

* **Electron Version:**
  * 5.0.2
* **Operating System:**
  * Windows 10 x64 latest
* **Last Known Working Electron version:**
  * 4.2.2

### Expected Behavior
The spellchecker is correctly called with contractions (and their parts)

### Actual Behavior
The spellchecker is now only called with the parts of the contractions.

### To Reproduce
Just use the spellcheck API anywhere.

### Additional Information
In ^4.0.0, the spellcheck API would call the spellchecker with first the contraction and then its parts (i.e. for `couldn't` it would be called with `couldn't`, `couldn`, `t` in order). The new ^5.0.0 API calls the spellchecker with an array of just the parts (i.e. for `couldn't` it would be called with `['couldn', 't']`. Therefore, it is now completely impossible to correctly handle contractions.

Thank you for looking into this. <3
atom/renderer/api/atom_api_spell_check_client.cc
for (;;) {  
    const auto status =
        text_iterator_.GetNextWord(&word, &word_start, &word_length);
    if (status == SpellcheckWordIterator::IS_END_OF_TEXT)
      break;
    if (status == SpellcheckWordIterator::IS_SKIPPABLE)
      continue;
    result.location = base::checked_cast<int>(word_start);
    result.length = base::checked_cast<int>(word_length);
    
    
    std::vector<base::string16> contraction_words;
    if (!IsContraction(scope, word, &contraction_words)) {
      words.push_back(word);
      word_map[word].push_back(result);
    } else {
      
      
      
      
      for (const auto& w : contraction_words) {
        words.push_back(w);
        word_map[w].push_back(result);
      }
    }
  }
  
  SpellCheckWords(scope, words);
}
void SpellCheckClient::OnSpellCheckDone(