LibGfx: Unpublish FloatSize from the global namespace

Libraries/LibGfx/FloatSize.h

@@ -115,5 +115,3 @@ inline const LogStream& operator<<(const LogStream& stream, const FloatSize& val
 }
 
 }
-
-using Gfx::FloatSize;

Libraries/LibHTML/Layout/LayoutBox.h

@@ -39,7 +39,7 @@ public:
     float y() const { return rect().y(); }
     float width() const { return rect().width(); }
     float height() const { return rect().height(); }
-    FloatSize size() const { return rect().size(); }
+    Gfx::FloatSize size() const { return rect().size(); }
     FloatPoint position() const { return rect().location(); }
 
     virtual HitTestResult hit_test(const Gfx::Point& position) const override;

Libraries/LibHTML/Layout/LayoutWidget.cpp

@@ -43,7 +43,7 @@ LayoutWidget::~LayoutWidget()
 
 void LayoutWidget::layout()
 {
-    rect().set_size(FloatSize(widget().width(), widget().height()));
+    rect().set_size(widget().width(), widget().height());
     LayoutReplaced::layout();
     widget().move_to(rect().x(), rect().y());
 }