Remove resource type-specific fetching logic from ResourceFetcher

Source/core/fetch/DocumentResource.cpp

Index: Source/core/fetch/DocumentResource.cpp
diff --git a/Source/core/fetch/DocumentResource.cpp b/Source/core/fetch/DocumentResource.cpp
index 397d5fdf646f0224de041b89d4126ea62c9fc229..a73798c934be6da2060c2edf8f10d4b771d23f60 100644
--- a/Source/core/fetch/DocumentResource.cpp
+++ b/Source/core/fetch/DocumentResource.cpp
@@ -25,11 +25,20 @@
 #include "core/fetch/DocumentResource.h"
 
 #include "core/dom/XMLDocument.h"
+#include "core/fetch/FetchRequest.h"
+#include "core/fetch/ResourceFetcher.h"
 #include "platform/SharedBuffer.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
+ResourcePtr<DocumentResource> DocumentResource::fetchSVGDocument(FetchRequest& request, ResourceFetcher* fetcher)
+{
+    ASSERT(request.resourceRequest().frameType() == WebURLRequest::FrameTypeNone);
+    request.mutableResourceRequest().setRequestContext(WebURLRequest::RequestContextImage);
+    return toDocumentResource(fetcher->requestResource(request, SVGDocumentResourceFactory()));
+}
+
 DocumentResource::DocumentResource(const ResourceRequest& request, Type type)
     : Resource(request, type)
     , m_decoder(TextResourceDecoder::create("application/xml"))