Revert of Detach old frame on WebFrame::swap.

Source/core/frame/Frame.h

Index: Source/core/frame/Frame.h
diff --git a/Source/core/frame/Frame.h b/Source/core/frame/Frame.h
index 77ed43bfdf68fab5c7a64f7c273a3c2822b84595..2bdfd460cef7a7b0a9ae3e8bc800dc332a701d27 100644
--- a/Source/core/frame/Frame.h
+++ b/Source/core/frame/Frame.h
@@ -55,8 +55,6 @@
 class WindowProxyManager;
 struct FrameLoadRequest;
 
-enum class FrameDetachType { Remove, Swap };
-
 // Status of user gesture.
 enum class UserGestureStatus { Active, None };
 
@@ -78,7 +76,7 @@
     virtual void navigate(const FrameLoadRequest&) = 0;
     virtual void reload(FrameLoadType, ClientRedirectPolicy) = 0;
 
-    virtual void detach(FrameDetachType);
+    virtual void detach();
     void detachChildren();
     virtual void disconnectOwnerElement();
 
@@ -105,12 +103,6 @@
     Frame* findFrameForNavigation(const AtomicString& name, Frame& activeFrame);
     Frame* findUnsafeParentScrollPropagationBoundary();
 
-    // This prepares the Frame for the next commit. It will detach children,
-    // dispatch unload events, abort XHR requests and detach the document.
-    // Returns true if the frame is ready to receive the next commit, or false
-    // otherwise.
-    virtual bool prepareForCommit() = 0;
-    void prepareSwapFrom(Frame*);
     void finishSwapFrom(Frame*);
 
     bool canNavigate(const Frame&);