Remove unnecessary includes from KURL.h

Source/platform/weborigin/KURL.h

Index: Source/platform/weborigin/KURL.h
diff --git a/Source/platform/weborigin/KURL.h b/Source/platform/weborigin/KURL.h
index 9018e01397d213811fb023f3b8d51b26d996b1d5..6133ace85fe6c86f4f2649f17144c21966e00ffb 100644
--- a/Source/platform/weborigin/KURL.h
+++ b/Source/platform/weborigin/KURL.h
@@ -28,15 +28,16 @@
 
 #include "platform/PlatformExport.h"
 #include "wtf/Forward.h"
-#include "wtf/HashMap.h"
 #include "wtf/HashTableDeletedValueType.h"
 #include "wtf/OwnPtr.h"
-#include "wtf/text/CString.h"
-#include "wtf/text/TextEncoding.h"
 #include "wtf/text/WTFString.h"
 #include <url/third_party/mozilla/url_parse.h>
 #include <url/url_canon.h>
 
+namespace WTF {
+class TextEncoding;
+}
+
 namespace WebCore {
 
 struct KURLHash;