Prerender: Disable prefetch if there's an appcache.

third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp

Index: third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp b/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp
index 1f052c530f347377540dcc3e8f3e55f01c593a48..195bb025c9bd36344943a03fad9d359a7852f5ad 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp
+++ b/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp
@@ -895,6 +895,10 @@ void HTMLDocumentParser::Append(const String& input_source) {
   const SegmentedString source(input_source);
 
   if (GetDocument()->IsPrefetchOnly()) {
+    // Do not prefetch if there is an appcache.
+    if (GetDocument()->Loader()->GetResponse().AppCacheID() != 0)
+      return;
+
     if (!preload_scanner_)
       preload_scanner_ = CreatePreloadScanner();