Remove blink::Resource::Type::LinkPrefetch and replace it by a flag

third_party/WebKit/Source/core/fetch/LinkFetchResource.cpp

Index: third_party/WebKit/Source/core/fetch/LinkFetchResource.cpp
diff --git a/third_party/WebKit/Source/core/fetch/LinkFetchResource.cpp b/third_party/WebKit/Source/core/fetch/LinkFetchResource.cpp
index 02d01ed41877041e7a48087076a45174150654d8..2241638e203cb74e2c2ebe6df11e129e7d6774e3 100644
--- a/third_party/WebKit/Source/core/fetch/LinkFetchResource.cpp
+++ b/third_party/WebKit/Source/core/fetch/LinkFetchResource.cpp
@@ -12,7 +12,7 @@ namespace blink {
 
 Resource* LinkFetchResource::fetch(Resource::Type type, FetchRequest& request, ResourceFetcher* fetcher)
 {
-    ASSERT(type == LinkPrefetch);
+    DCHECK(request.isPrefetch());
     ASSERT(request.resourceRequest().frameType() == WebURLRequest::FrameTypeNone);
     fetcher->determineRequestContext(request.mutableResourceRequest(), type);
     return fetcher->requestResource(request, LinkResourceFactory(type));
@@ -27,4 +27,9 @@ LinkFetchResource::~LinkFetchResource()
 {
 }
 
+bool LinkFetchResource::isPrefetch() const
+{
+    return true;
+}
+
 } // namespace blink