Reland "Streamline frame detach"

Source/web/tests/WebFrameTest.cpp

Index: Source/web/tests/WebFrameTest.cpp
diff --git a/Source/web/tests/WebFrameTest.cpp b/Source/web/tests/WebFrameTest.cpp
index 7843934fc0f09ddb6ef58ca0c52987d5a8236ca1..af39cfbe413dc1f34605ba6a074e37f627eb093a 100644
--- a/Source/web/tests/WebFrameTest.cpp
+++ b/Source/web/tests/WebFrameTest.cpp
@@ -3779,9 +3779,7 @@ TEST_F(WebFrameTest, FindDetachFrameWhileScopingStrings)
     EXPECT_FALSE(client.findResultsAreReady());
 
     mainFrame->resetMatchCount();
-
-    for (WebFrame* frame = mainFrame; frame; frame = frame->traverseNext(false))
-        frame->scopeStringMatches(kFindIdentifier, searchText, options, true);
+    mainFrame->scopeStringMatches(kFindIdentifier, searchText, options, true);
 
     // The first scopeStringMatches will have reset the state. Detach before it actually scopes.
     EXPECT_TRUE(mainFrame->document().getElementById("frame").remove());