Plumb selection bounds as a single unit

Source/web/WebViewImpl.h

Index: Source/web/WebViewImpl.h
diff --git a/Source/web/WebViewImpl.h b/Source/web/WebViewImpl.h
index 837dac28ef4e84a72f88a20a2223555b0b9b0b3c..424decd6b9b7ec9324a311fb04236d853356296d 100644
--- a/Source/web/WebViewImpl.h
+++ b/Source/web/WebViewImpl.h
@@ -85,10 +85,9 @@ class WebLocalFrameImpl;
 class WebImage;
 class WebPagePopupImpl;
 class WebPlugin;
+class WebSelection;
 class WebSettingsImpl;
 
-struct WebSelectionBound;
-
 class WebViewImpl final : public WebView
     , public RefCounted<WebViewImpl>
     , public WebGestureCurveTarget
@@ -481,8 +480,8 @@ public:
     void enterFullScreenForElement(Element*);
     void exitFullScreenForElement(Element*);
 
-    void clearCompositedSelectionBounds();
-    void updateCompositedSelectionBounds(const WebSelectionBound& anchor, const WebSelectionBound& focus);
+    void clearCompositedSelection();
+    void updateCompositedSelection(const WebSelection&);
 
     // Exposed for the purpose of overriding device metrics.
     void sendResizeEventAndRepaint();