#### 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
const SpellCheckScope& scope,
    const base::string16& contraction,
    std::vector<base::string16>* contraction_words) {
  DCHECK(contraction_iterator_.IsInitialized());
  contraction_iterator_.SetText(contraction.c_str(), contraction.length());
  base::string16 word;
  size_t word_start;
  size_t word_length;
  for (auto status =
           contraction_iterator_.GetNextWord(&word, &word_start, &word_length);
       status != SpellcheckWordIterator::IS_END_OF_TEXT;
       status = contraction_iterator_.GetNextWord(&word, &word_start,
                                                  &word_length)) {
    if (status == SpellcheckWordIterator::IS_SKIPPABLE)
      continue;
    contraction_words->push_back(word);
  }
  return contraction_words->size() > 1;
}
SpellCheckClient::SpellCheckScope::SpellCheckScope(
    const SpellCheckClient& client)
    : handle_scope_(client.isolate_),
      context_scope_(
          v8::Local<v8::Context>::New(client.isolate_, client.context_)),
      provider_(client.provider_.NewHandle()),
      spell_check_(client.spell_check_.NewHandle()) {}
SpellCheckClient::SpellCheckScope::~SpellCheckScope() = default;
}  
}