PlzNavigate: Fix wrong "Cache-Control" header.

third_party/WebKit/Source/core/loader/FrameFetchContext.cpp

Index: third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
index 084840313156c8d0af5d142d4ad3dc055b8c58c4..d64a12e2138506af16df1b62040b610655c993ec 100644
--- a/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameFetchContext.cpp
@@ -227,6 +227,10 @@ void FrameFetchContext::AddAdditionalRequestHeaders(ResourceRequest& request,
     request.SetHTTPHeaderField("Save-Data", "on");
 }
 
+// TODO(toyoshim, arthursonzogni): PlzNavigate doesn't use this function to set
+// the ResourceRequest's cache policy. The cache policy determination needs to
+// be factored out from FrameFetchContext and moved to the FrameLoader for
+// instance.
 WebCachePolicy FrameFetchContext::ResourceRequestCachePolicy(
     const ResourceRequest& request,
     Resource::Type type,