Add an OriginFilterBuilder class for [white|black]listing origins.

content/public/browser/download_manager.h

Index: content/public/browser/download_manager.h
diff --git a/content/public/browser/download_manager.h b/content/public/browser/download_manager.h
index ca367eb3884001a444047a1b2c642c2d5a43ffd9..c7888525db0f7858d0a84999d3eebdff4343a153 100644
--- a/content/public/browser/download_manager.h
+++ b/content/public/browser/download_manager.h
@@ -114,17 +114,14 @@ class CONTENT_EXPORT DownloadManager : public base::SupportsUserData::Data {
       scoped_ptr<ByteStreamReader> stream,
       const DownloadUrlParameters::OnStartedCallback& on_started) = 0;
 
-  // Remove downloads which are same-origin with the given origin and pertain to
-  // the given time constraints. (See |RemoveDownloadsBetween|.)
-  virtual int RemoveDownloadsByOriginAndTime(const url::Origin& origin,
-                                             base::Time remove_begin,
-                                             base::Time remove_end) = 0;
-
-  // Remove downloads after remove_begin (inclusive) and before remove_end
-  // (exclusive). You may pass in null Time values to do an unbounded delete
-  // in either direction.
-  virtual int RemoveDownloadsBetween(base::Time remove_begin,
-                                     base::Time remove_end) = 0;
+  // Remove downloads whose URLs match the |url_filter| and are within
+  // the given time constraints - after remove_begin (inclusive) and before
+  // remove_end (exclusive). You may pass in null Time values to do an unbounded
+  // delete in either direction.
+  virtual int RemoveDownloadsByOriginAndTime(
+      const base::Callback<bool(const GURL&)>& url_filter,
+      base::Time remove_begin,
+      base::Time remove_end) = 0;
 
   // Remove downloads will delete all downloads that have a timestamp that is
   // the same or more recent than |remove_begin|. The number of downloads