#### 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
#include "atom/renderer/api/atom_api_spell_check_client.h"
#include <map>
#include <utility>
#include <vector>
#include "atom/common/native_mate_converters/string16_converter.h"
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
#include "base/threading/thread_task_runner_handle.h"
#include "components/spellcheck/renderer/spellcheck_worditerator.h"
#include "native_mate/converter.h"
#include "native_mate/dictionary.h"
#include "native_mate/function_template.h"
#include "third_party/blink/public/web/web_text_checking_completion.h"
#include "third_party/blink/public/web/web_text_checking_result.h"
#include "third_party/icu/source/common/unicode/uscript.h"
namespace atom {
namespace api {
namespace {
bool HasWordCharacters(const base::string16& text, int index) {