Implement the logic to find the correct <link> for Manifest in Document.

Source/core/loader/DocumentLoader.cpp

Index: Source/core/loader/DocumentLoader.cpp
diff --git a/Source/core/loader/DocumentLoader.cpp b/Source/core/loader/DocumentLoader.cpp
index 969a91d665e88966ba6973baa06ca40e0328cd91..dfbca73540ebb92c6734f0a5416ee0e3c2b04d5e 100644
--- a/Source/core/loader/DocumentLoader.cpp
+++ b/Source/core/loader/DocumentLoader.cpp
@@ -275,7 +275,7 @@ void DocumentLoader::finishedLoading(double finishTime)
     // If the document specified an application cache manifest, it violates the author's intent if we store it in the memory cache
     // and deny the appcache the chance to intercept it in the future, so remove from the memory cache.
     if (m_frame) {
-        if (m_mainResource && m_frame->document()->hasManifest())
+        if (m_mainResource && m_frame->document()->hasAppCacheManifest())
             memoryCache()->remove(m_mainResource.get());
     }
     m_applicationCacheHost->finishedLoadingMainResource();