Remove dead markup serialization code.

sky/engine/public/web/WebFrame.h

Index: sky/engine/public/web/WebFrame.h
diff --git a/sky/engine/public/web/WebFrame.h b/sky/engine/public/web/WebFrame.h
index 636ae1b550f8cc7c0f4c0d178c5f5bf6a7511447..99588207a45d4a54655a71e7722c968bfcc6ac9f 100644
--- a/sky/engine/public/web/WebFrame.h
+++ b/sky/engine/public/web/WebFrame.h
@@ -242,7 +242,6 @@ public:
     virtual WebRange selectionRange() const = 0;
 
     virtual WebString selectionAsText() const = 0;
-    virtual WebString selectionAsMarkup() const = 0;
 
     // Expands the selection to a word around the caret and returns
     // true. Does nothing and returns false if there is no caret or
@@ -279,10 +278,6 @@ public:
     // frame will be separated by an empty line.
     virtual WebString contentAsText(size_t maxChars) const = 0;
 
-    // Returns HTML text for the contents of this frame.  This is generated
-    // from the DOM.
-    virtual WebString contentAsMarkup() const = 0;
-
     // Returns a text representation of the render tree.  This method is used
     // to support layout tests.
     virtual WebString renderTreeAsText(RenderAsTextControls toShow = RenderAsTextNormal) const = 0;