Clarify GraphicsContext::beginLayer()/endLayer() have unexpected behaviors.

Source/core/rendering/svg/RenderSVGResourceClipper.cpp

Index: Source/core/rendering/svg/RenderSVGResourceClipper.cpp
diff --git a/Source/core/rendering/svg/RenderSVGResourceClipper.cpp b/Source/core/rendering/svg/RenderSVGResourceClipper.cpp
index 60f3018c3882b867b3c11b7dae3ac55f0b34750b..fdd35d6a0ec12ee102194b6ee67a92b062bc4dc7 100644
--- a/Source/core/rendering/svg/RenderSVGResourceClipper.cpp
+++ b/Source/core/rendering/svg/RenderSVGResourceClipper.cpp
@@ -185,7 +185,7 @@ bool RenderSVGResourceClipper::applyClippingToContext(RenderObject* target, cons
             //   b) pop multiple states if needed (similarly to SkCanvas::restoreToCount())
             // Then we should be able to replace this mess with a single, top-level GCSS.
             maskContentSaver.restore();
-            context->restoreLayer();
+            context->endLayer();
             return false;
         }