Detach old frame on WebFrame::swap.

Source/core/page/PrintContextTest.cpp

Index: Source/core/page/PrintContextTest.cpp
diff --git a/Source/core/page/PrintContextTest.cpp b/Source/core/page/PrintContextTest.cpp
index 67d116405aa1c783e50d2f08cbc3662926d0c06c..9340f01ee2443360dabda038cab9d0edfa40d3ec 100644
--- a/Source/core/page/PrintContextTest.cpp
+++ b/Source/core/page/PrintContextTest.cpp
@@ -327,7 +327,7 @@ TEST_F(PrintContextFrameTest, WithSubframe)
     EXPECT_EQ(MockCanvas::DrawRect, operations[1].type);
     EXPECT_SKRECT_EQ(350, 360, 270, 280, operations[1].rect);
 
-    subframe->detach();
+    subframe->detach(DetachType::Remove);
     static_cast<SingleChildFrameLoaderClient*>(document().frame()->client())->setChild(nullptr);
     document().frame()->host()->decrementSubframeCount();
 }
@@ -370,7 +370,7 @@ TEST_F(PrintContextFrameTest, WithScrolledSubframe)
     EXPECT_EQ(MockCanvas::DrawRect, operations[2].type);
     EXPECT_SKRECT_EQ(250, 260, 270, 280, operations[2].rect);
 
-    subframe->detach();
+    subframe->detach(DetachType::Remove);
     static_cast<SingleChildFrameLoaderClient*>(document().frame()->client())->setChild(nullptr);
     document().frame()->host()->decrementSubframeCount();
 }