Use the complete url when blocking images.

Image urls that are relative to a base url need to be resolved before looking at
the scheme.

Bug: 2455482
diff --git a/WebCore/loader/DocLoader.cpp b/WebCore/loader/DocLoader.cpp
index 54dc733..8c0a1b2 100644
--- a/WebCore/loader/DocLoader.cpp
+++ b/WebCore/loader/DocLoader.cpp
@@ -331,7 +331,7 @@
     if (!m_blockNetworkImage)
         return false;
 
-    KURL kurl(ParsedURLString, url);
+    KURL kurl = m_doc->completeURL(url);
     if (kurl.protocolIs("http") || kurl.protocolIs("https"))
         return true;