Switch to WebFrame from the WebKit API....

webkit/api/public/WebString.h

Index: webkit/api/public/WebString.h
===================================================================
--- webkit/api/public/WebString.h	(revision 22886)
+++ webkit/api/public/WebString.h	(working copy)
@@ -40,7 +40,7 @@
 #endif
 
 namespace WebKit {
-
+    class WebCString;
     class WebStringPrivate;
 
     // A UTF-16 string container.  It is inexpensive to copy a WebString
@@ -77,6 +77,8 @@
         bool isEmpty() const { return length() == 0; }
         bool isNull() const { return m_private == 0; }
 
+        WEBKIT_API WebCString utf8() const;
+
         WEBKIT_API static WebString fromUTF8(const char* data, size_t length);
         WEBKIT_API static WebString fromUTF8(const char* data);