Revert "Create errors (especially cancellation errors) internally to WebCore, rather"

Source/core/loader/ResourceLoader.h

Index: Source/core/loader/ResourceLoader.h
diff --git a/Source/core/loader/ResourceLoader.h b/Source/core/loader/ResourceLoader.h
index 5ce40ec23d2365fa249d49c20cc772e848b06bb3..aaf1f539ca026b5ac96edc30b10af6b1b0797074 100644
--- a/Source/core/loader/ResourceLoader.h
+++ b/Source/core/loader/ResourceLoader.h
@@ -62,6 +62,9 @@ public:
     DocumentLoader* documentLoader() const { return m_documentLoader.get(); }
     CachedResource* cachedResource() { return m_resource; }
     const ResourceRequest& originalRequest() const { return m_originalRequest; }
+
+    ResourceError cancelledError();
+    ResourceError cannotShowURLError();
     
     void setDefersLoading(bool);
     bool defersLoading() const { return m_defersLoading; }