[Webkit-unassigned] [Bug 157010] QuotaExceededError when saving to localStorage in private mode - leaks users browsing preference

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157010

--- Comment #6 from Dima Voytenko <dvoytenko at google.com> ---
The issue with just ignoring writes is that it's no different really from throwing an exception from the point of view of private mode leak. E.g.

```
function isPrivateMode() {
  try {
    localStorage.setItem('a', 'b');
    return false;
  } catch(e) {
    return true;
  }
}
```

vs

```
function isPrivateMode() {
  localStorage.setItem('a', 'b');
  return localStorage.getItem('a') != 'b';
}
```

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