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

Source/core/platform/network/ResourceError.cpp

Index: Source/core/platform/network/ResourceError.cpp
===================================================================
--- Source/core/platform/network/ResourceError.cpp	(revision 148582)
+++ Source/core/platform/network/ResourceError.cpp	(working copy)
@@ -27,10 +27,19 @@
 #include "config.h"
 #include "ResourceError.h"
 
+#include <public/Platform.h>
+
 namespace WebCore {
 
 const char* const errorDomainWebKitInternal = "WebKitInternal";
 
+ResourceError ResourceError::cancelledError(const String& failingURL)
+{
+    ResourceError error("net", WebKit::Platform::current()->cancelledErrorCode(), failingURL, String());

[darin (slow to review), 2013/04/18 05:47:39]

Are there any issues with hard-coding "net" here?  It seems like we must have
some code on the Chromium side that also hard-codes that constant.  Hmm...

Hate to say this, but the other option is to have WebKit::Platform provide a
method to return a WebURLError object corresponding to cancellation.  /me ducks

+    error.setIsCancellation(true);
+    return error;
+}
+
 ResourceError ResourceError::copy() const
 {
     ResourceError errorCopy;