Refine BatteryStatus module

[Jinwoo Song]

Small refinements:
 - Return PassRef instead of PassRefPtr in create method
 - Switched to nullptr instead of 0 where appropriate.
 - Removed unused function and header file.
 - Removed unnecessary empty lines.

[Jinwoo Song]

Created attachment 227250 [details]
Patch

[Andreas Kling]

Comment on attachment 227250 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=227250&action=review

> Source/WebCore/Modules/battery/BatteryManager.cpp:39
> -    RefPtr<BatteryManager> batteryManager(adoptRef(new BatteryManager(navigator)));
> +    Ref<BatteryManager> batteryManager(adoptRef(*new BatteryManager(navigator)));
>      batteryManager->suspendIfNeeded();
> -    return batteryManager.release();
> +    return batteryManager.get();

This will ref() and deref() the object twice, it would be more efficient to write it like this:

auto batteryManager = adoptRef(*new BatteryManager(navigator));
batteryManager.get().suspendIfNeeded();
return std::move(batteryManager);

[Jinwoo Song]

(In reply to comment #2)
> (From update of attachment 227250 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=227250&action=review
> 
> > Source/WebCore/Modules/battery/BatteryManager.cpp:39
> > -    RefPtr<BatteryManager> batteryManager(adoptRef(new BatteryManager(navigator)));
> > +    Ref<BatteryManager> batteryManager(adoptRef(*new BatteryManager(navigator)));
> >      batteryManager->suspendIfNeeded();
> > -    return batteryManager.release();
> > +    return batteryManager.get();
> 
> This will ref() and deref() the object twice, it would be more efficient to write it like this:
> 
> auto batteryManager = adoptRef(*new BatteryManager(navigator));
> batteryManager.get().suspendIfNeeded();
> return std::move(batteryManager);

Thanks for advice! I'll modify it.

[Jinwoo Song]

Created attachment 227260 [details]
Patch

Applied Kling's comment.

[WebKit Commit Bot]

Comment on attachment 227260 [details]
Patch

Clearing flags on attachment: 227260

Committed r165950: <http://trac.webkit.org/changeset/165950>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.