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 6ab8b3794e80c5111b99acb545eef2764214b630..76c3281b10922bbce4cb0e787228f8ac264e453e 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -463,6 +463,10 @@ 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;