WIP: Move 'X-Frame-Options' checking to the browser.

content/public/browser/navigation_handle.h

Index: content/public/browser/navigation_handle.h
diff --git a/content/public/browser/navigation_handle.h b/content/public/browser/navigation_handle.h
index 0bfbca8c7115ebb8c566f501d010970fdd4f4a57..cf8086b7d819d1f8768389dca5534025e177a527 100644
--- a/content/public/browser/navigation_handle.h
+++ b/content/public/browser/navigation_handle.h
@@ -13,6 +13,10 @@
 
 class GURL;
 
+namespace net {
+class HttpResponseHeaders;
+}
+
 namespace content {
 class NavigationThrottle;
 class RenderFrameHost;
@@ -70,6 +74,19 @@ class CONTENT_EXPORT NavigationHandle {
   // handlers.
   virtual bool IsExternalProtocol() = 0;
 
+  // Parameters available at network response start time ----------------------
+  //
+  // The following parameters are only available when the network response is
+  // made for the navigation (or at commit time if no network request was made).
+  // This corresponds to NavigationThrottle::WillProcessResponse. They should
+  // not be queried before that.
+
+  // Returns the response headers for the request. This can only be accessed
+  // after a redirect was encountered or after the the navigation is ready to
+  // commit. It should not be modified, as modifications will not be reflected
+  // in the network stack.
+  virtual const net::HttpResponseHeaders* GetResponseHeaders() = 0;
+
   // Navigation control flow --------------------------------------------------
 
   // The net error code if an error happened prior to commit. Otherwise it will