Use ResourceRequestInfo::GetWebContents in DownloadRequestLimiter

content/public/browser/resource_request_info.h

Index: content/public/browser/resource_request_info.h
diff --git a/content/public/browser/resource_request_info.h b/content/public/browser/resource_request_info.h
index 50b04bf7c0bb1f55147d05033ea0d67151a58820..9e8c86057cb5ce28d41e7619edcf6f29d66321ab 100644
--- a/content/public/browser/resource_request_info.h
+++ b/content/public/browser/resource_request_info.h
@@ -6,6 +6,7 @@
 #define CONTENT_PUBLIC_BROWSER_RESOURCE_REQUEST_INFO_H_
 
 #include "base/basictypes.h"
+#include "base/callback_forward.h"
 #include "content/common/content_export.h"
 #include "content/public/common/resource_type.h"
 #include "third_party/WebKit/public/platform/WebPageVisibilityState.h"
@@ -18,6 +19,7 @@ class URLRequest;
 
 namespace content {
 class ResourceContext;
+class WebContents;
 
 // Each URLRequest allocated by the ResourceDispatcherHost has a
 // ResourceRequestInfo instance associated with it.
@@ -51,6 +53,15 @@ class ResourceRequestInfo {
       int* render_process_id,
       int* render_frame_id);
 
+  // Returns a callback that returns a pointer to the WebContents this request
+  // is associated with, or nullptr if it no longer exists or the request is
+  // not associated with a WebContents. The callback should only run on the UI
+  // thread.
+  // Note: Not all resource requests will be owned by a WebContents. For
+  // example, requests made by a ServiceWorker.
+  virtual base::Callback<WebContents*(void)> GetWebContentsForRequest()
+      const = 0;
+
   // Returns the associated ResourceContext.
   virtual ResourceContext* GetContext() const = 0;