Invalidate line break selection rects when selected.

Source/core/layout/LayoutBR.h

Index: Source/core/layout/LayoutBR.h
diff --git a/Source/core/layout/LayoutBR.h b/Source/core/layout/LayoutBR.h
index c7e738fa18e518ed2a529af17c17f95e8d57d872..84b8bb09cc38422f1d216815221170f747766a65 100644
--- a/Source/core/layout/LayoutBR.h
+++ b/Source/core/layout/LayoutBR.h
@@ -36,12 +36,7 @@ public:
 
     const char* name() const override { return "LayoutBR"; }
 
-    LayoutRect selectionRectForPaintInvalidation(const LayoutBoxModelObject* /* paintInvalidationContainer */) const override
-    {
-        // TODO(wkorman): When selected we need to return a rect that includes the
-        // space highlighted to illustrate a newline.
-        return LayoutRect();
-    }
+    LayoutRect selectionRectForPaintInvalidation(const LayoutBoxModelObject* /* paintInvalidationContainer */) const override;
 
     float width(unsigned /* from */, unsigned /* len */, const Font&, LayoutUnit /* xpos */, TextDirection, HashSet<const SimpleFontData*>* = nullptr /* fallbackFonts */ , FloatRect* /* glyphBounds */ = nullptr) const override { return 0; }
     float width(unsigned /* from */, unsigned /* len */, LayoutUnit /* xpos */, TextDirection, bool = false /* firstLine */, HashSet<const SimpleFontData*>* = nullptr /* fallbackFonts */, FloatRect* /* glyphBounds */ = nullptr) const override { return 0; }