face: API to remove all pending Interests

Change-Id: Iac341689270698b66ec6228c27e23ea6cf3e5e59
Refs: #3300
diff --git a/src/face.hpp b/src/face.hpp
index a07e293..e07f541 100644
--- a/src/face.hpp
+++ b/src/face.hpp
@@ -273,6 +273,12 @@
   removePendingInterest(const PendingInterestId* pendingInterestId);
 
   /**
+   * @brief Cancel all previously expressed Interests
+   */
+  void
+  removeAllPendingInterests();
+
+  /**
    * @brief Get number of pending Interests
    */
   size_t