Fix HTMLDocumentParser::stopBackgroundParser crash

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

Index: third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.h
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.h b/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.h
index 2a540621a2a98429883110ece73ceb5f7c58a148..e83f3bbd6411bb80acc842efc99330e4db6cc7de 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.h
+++ b/third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.h
@@ -69,6 +69,7 @@ class TokenizedChunkQueue;
 
 class HTMLDocumentParser :  public ScriptableDocumentParser, private HTMLScriptRunnerHost {
     USING_GARBAGE_COLLECTED_MIXIN(HTMLDocumentParser);
+    USING_PRE_FINALIZER(HTMLDocumentParser, dispose);
 public:
     static HTMLDocumentParser* create(HTMLDocument& document, ParserSynchronizationPolicy backgroundParsingPolicy)
     {
@@ -77,6 +78,9 @@ public:
     ~HTMLDocumentParser() override;
     DECLARE_VIRTUAL_TRACE();
 
+    // TODO(alexclarke): Remove when background parser goes away.
+    void dispose();
+
     // Exposed for HTMLParserScheduler
     void resumeParsingAfterYield();