doc.write blocking intervention warning header

third_party/WebKit/Source/core/fetch/FetchContext.h

Index: third_party/WebKit/Source/core/fetch/FetchContext.h
diff --git a/third_party/WebKit/Source/core/fetch/FetchContext.h b/third_party/WebKit/Source/core/fetch/FetchContext.h
index 1fd7c66797641cae880c29c22ad19b91c725cbfa..e3d7f7e81041747f9bde53d3c6a62e8ab64abb9b 100644
--- a/third_party/WebKit/Source/core/fetch/FetchContext.h
+++ b/third_party/WebKit/Source/core/fetch/FetchContext.h
@@ -72,8 +72,11 @@ class CORE_EXPORT FetchContext
 
   virtual void addAdditionalRequestHeaders(ResourceRequest&, FetchResourceType);
   virtual CachePolicy getCachePolicy() const;
+  // Returns the cache policy for the resource. ResourceRequest is not passed as
+  // a const reference as a header needs to be added for doc.write blocking
+  // intervention.
   virtual WebCachePolicy resourceRequestCachePolicy(
-      const ResourceRequest&,
+      ResourceRequest&,
       Resource::Type,
       FetchRequest::DeferOption) const;