Replicate Content-Security-Policy into remote frame proxies.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 670731fe8b7b6cac0b9500f9e188131f76d9007f..b5c3ffc9ac36731226bbb4fa62d6d655db6d34b5 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -465,6 +465,10 @@ class CONTENT_EXPORT RenderFrameImpl
       bool is_potentially_trustworthy_unique_origin) override;
   void didChangeSandboxFlags(blink::WebFrame* child_frame,
                              blink::WebSandboxFlags flags) override;
+  void didAddContentSecurityPolicy(
+      const blink::WebString& header_value,
+      blink::WebContentSecurityPolicyType type,
+      blink::WebContentSecurityPolicySource source) override;
   void didChangeFrameOwnerProperties(
       blink::WebFrame* child_frame,
       const blink::WebFrameOwnerProperties& frame_owner_properties) override;