Trusted plugin: Remove EnumerateManifestKeys.

ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc

Index: ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc
diff --git a/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc b/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc
index 14d055fda15dff884f3f65dde8af7bbf3f9eadf6..fd108b7f1e33fa2c979d30f330b454ac2eb9b944 100644
--- a/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc
+++ b/ppapi/native_client/src/trusted/plugin/pnacl_coordinator.cc
@@ -56,13 +56,6 @@ class PnaclManifest : public Manifest {
     return false;
   }
 
-  virtual bool GetFileKeys(std::set<nacl::string>* keys) const {
-    // Does not support enumeration.
-    PLUGIN_PRINTF(("PnaclManifest does not support key enumeration\n"));
-    UNREFERENCED_PARAMETER(keys);
-    return false;
-  }
-
   virtual bool ResolveKey(const nacl::string& key,
                           nacl::string* full_url,
                           PP_PNaClOptions* pnacl_options,