Remove the Document.charset setter (making it readonly)

LayoutTests/fast/dom/frame-loading-via-document-write.html

Index: LayoutTests/fast/dom/frame-loading-via-document-write.html
diff --git a/LayoutTests/fast/dom/frame-loading-via-document-write.html b/LayoutTests/fast/dom/frame-loading-via-document-write.html
index bb1067207ccb75389944f67f6ade91a9e39e943c..cfa8008fd7081c8ec3fd7825a6dd4637a4433d0e 100644
--- a/LayoutTests/fast/dom/frame-loading-via-document-write.html
+++ b/LayoutTests/fast/dom/frame-loading-via-document-write.html
@@ -28,7 +28,6 @@ function buildFrameset()
               "</td></tr></table></body></html>";
 
     frames['topRow'].document.open("text/html","replace");
-    frames['topRow'].document.charset=document.charset;
     frames['topRow'].document.write(outHTML);
     frames['topRow'].document.close();
 
@@ -45,7 +44,6 @@ function buildFrameset()
               "</td></tr></table></body></html>";
 
     frames['middleRow'].document.open("text/html","replace");
-    frames['middleRow'].document.charset=document.charset;
     frames['middleRow'].document.write(outHTML);
     frames['middleRow'].document.close();
 
@@ -56,7 +54,6 @@ function buildFrameset()
               "</td></tr></table></body></html>";
 
     frames['bottomRow'].document.open("text/html","replace");
-    frames['bottomRow'].document.charset=document.charset;
     frames['bottomRow'].document.write(outHTML);
     frames['bottomRow'].document.close();
 }