Remove UserScript support, which is not used by Chromium

Source/WebCore/page/Frame.h

Index: Source/WebCore/page/Frame.h
diff --git a/Source/WebCore/page/Frame.h b/Source/WebCore/page/Frame.h
index d37649f0cb7ec08795ae010f73635827c3a3669f..5208485c0df00d2c7a9f947bad9ea05f81a2dec8 100644
--- a/Source/WebCore/page/Frame.h
+++ b/Source/WebCore/page/Frame.h
@@ -38,7 +38,6 @@
 #include "FrameTree.h"
 #include "NavigationScheduler.h"
 #include "ScriptController.h"
-#include "UserScriptTypes.h"
 
 namespace WebCore {
 
@@ -108,8 +107,6 @@ namespace WebCore {
 
         bool inScope(TreeScope*) const;
 
-        void injectUserScripts(UserScriptInjectionTime);
-        
         String layerTreeAsText(LayerTreeFlags = 0) const;
         String trackedRepaintRectsAsText() const;
 
@@ -174,8 +171,6 @@ namespace WebCore {
     private:
         Frame(Page*, HTMLFrameOwnerElement*, FrameLoaderClient*);
 
-        void injectUserScriptsForWorld(DOMWrapperWorld*, const UserScriptVector&, UserScriptInjectionTime);
-
         HashSet<FrameDestructionObserver*> m_destructionObservers;
 
         Page* m_page;