Update heartbeats-simple to 0.3.0
Updated heartbeats-simple dependency for native changes:
-Collapse libraries into one.
-Remove overriding of some default CMake behavior.
-Windows compatibility with compiler flags, locking, and sleeping in example (thanks Jack Moffitt and Vladimir Vukicevic).
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Implement private browsing for mozbrowser
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Support the `mozprivatebrowsing` attribute on mozbrowser iframes. This separates the non-private and private sessions in terms of cookies, HSTS lists, cached HTTP credentials, HTTP connection pools, and web storage. The private session is shared between all private mozbrowsers, and lasts until shutdown.
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Implement filter for file-type input's accept attribute
Now the two sides are pasted together with the new version of `mime_guess` landed.
I tested this thing locally with stuff like this:
```html
<input id="input_file" type="file" accept=".doc,.docx,.xml,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document"></input>
<a onclick="open_file();">Click</a>
<script type="text/javascript">
function open_file() {
console.log("Open file");
document.getElementById("input_file").click();
}
</script>
```
Will WPT be able to handle this automatically?
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Use *const AtomicUsize rather than *mut AtomicUsize in WorkQueue.
Atomics use internal mutability, so this *mut is at best confusing.
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Account for the font of empty input fields
The font of empty fragments is not accounted for in layout. This behavior is incorrect when part of an input field.
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Silent some warnings
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