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 cf3f40e1c809ac8cfa2c6ec915a7aa39e4bd0593..da89c2ecc07dce9c8be5eb062322819f6273698b 100644
--- a/Source/web/WebViewImpl.h
+++ b/Source/web/WebViewImpl.h
@@ -86,10 +86,9 @@ class WebLocalFrameImpl;
 class WebImage;
 class WebPagePopupImpl;
 class WebPlugin;
+class WebSelection;
 class WebSettingsImpl;
 
-struct WebSelectionBound;
-
 class WebViewImpl final : public WebView
     , public RefCounted<WebViewImpl>
     , public WebGestureCurveTarget
@@ -485,8 +484,8 @@ 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();