Convert some call sites to use explicit LayoutRect->FloatRect conversion.

Source/core/paint/ImagePainter.cpp

Index: Source/core/paint/ImagePainter.cpp
diff --git a/Source/core/paint/ImagePainter.cpp b/Source/core/paint/ImagePainter.cpp
index a765d4f5653a1b67662e6c9a3eac747bcacb85a8..41843b2a01b6d1aa3c52cb2a4b8930dbc489fa48 100644
--- a/Source/core/paint/ImagePainter.cpp
+++ b/Source/core/paint/ImagePainter.cpp
@@ -108,7 +108,8 @@ void ImagePainter::paintReplaced(const PaintInfo& paintInfo, const LayoutPoint&
         bool clip = !contentRect.contains(paintRect);
         if (clip) {
             context->save();
-            context->clip(contentRect);
+            // TODO(chrishtr): this should be pixel-snapped.
+            context->clip(FloatRect(contentRect));
         }
 
         paintIntoRect(context, paintRect);