Make the LayoutRect->FloatRect constructor explicit.

Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp

Index: Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
diff --git a/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp b/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
index 947a8ce7c5f4095fdc5a89c20402f6cd96371f20..4c8f1f52a1e431a1fd4b1d7e3dc503cb9c9b8537 100644
--- a/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
+++ b/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
@@ -413,7 +413,7 @@ void DeprecatedPaintLayerScrollableArea::setScrollOffset(const DoublePoint& newS
     // The caret rect needs to be invalidated after scrolling
     frame->selection().setCaretRectNeedsUpdate();
 
-    FloatQuad quadForFakeMouseMoveEvent = FloatQuad(layer()->layoutObject()->previousPaintInvalidationRectIncludingCompositedScrolling(*paintInvalidationContainer));
+    FloatQuad quadForFakeMouseMoveEvent = FloatQuad(FloatRect(layer()->layoutObject()->previousPaintInvalidationRectIncludingCompositedScrolling(*paintInvalidationContainer)));
 
     quadForFakeMouseMoveEvent = paintInvalidationContainer->localToAbsoluteQuad(quadForFakeMouseMoveEvent);
     frame->eventHandler().dispatchFakeMouseMoveEventSoonInQuad(quadForFakeMouseMoveEvent);