--- a/xpcom/reflect/xptinfo/nsIInterfaceInfoManager.idl
+++ b/xpcom/reflect/xptinfo/nsIInterfaceInfoManager.idl
@@ -4,30 +4,22 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 /* The nsIInterfaceInfoManager public declaration. */
 
 
 #include "nsISupports.idl"
 
 interface nsIInterfaceInfo;
-interface nsIEnumerator;
 
 [builtinclass, uuid(1d53d8d9-1d92-428f-b5cc-198b55e897d7)]
 interface nsIInterfaceInfoManager : nsISupports
 {
     nsIInterfaceInfo getInfoForIID(in nsIIDPtr iid);
     nsIInterfaceInfo getInfoForName(in string name);
-
-    nsIIDPtr getIIDForName(in string name);
-    string   getNameForIID(in nsIIDPtr iid);
-
-    void autoRegisterInterfaces();
-
-    nsIEnumerator enumerateInterfacesWhoseNamesStartWith(in string prefix);
 };
 
 %{C++
 #define NS_INTERFACEINFOMANAGER_SERVICE_CID            \
  { /* 13bef784-f8e0-4f96-85c1-09f9ef4f9a19 */          \
   0x13bef784, 0xf8e0, 0x4f96,                          \
   {0x85, 0xc1, 0x09, 0xf9, 0xef, 0x4f, 0x9a, 0x19} }
 

--- a/xpcom/reflect/xptinfo/xptiInterfaceInfoManager.cpp
+++ b/xpcom/reflect/xptinfo/xptiInterfaceInfoManager.cpp
@@ -216,48 +216,16 @@ XPTInterfaceInfoManager::GetInfoForName(
     NS_ASSERTION(name, "bad param");
     NS_ASSERTION(_retval, "bad param");
 
     ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
     xptiInterfaceEntry* entry = mWorkingSet.mNameTable.Get(name);
     return EntryToInfo(entry, _retval);
 }
 
-NS_IMETHODIMP
-XPTInterfaceInfoManager::GetIIDForName(const char *name, nsIID * *_retval)
-{
-    NS_ASSERTION(name, "bad param");
-    NS_ASSERTION(_retval, "bad param");
-
-    ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
-    xptiInterfaceEntry* entry = mWorkingSet.mNameTable.Get(name);
-    if (!entry) {
-        *_retval = nullptr;
-        return NS_ERROR_FAILURE;
-    }
-
-    return entry->GetIID(_retval);
-}
-
-NS_IMETHODIMP
-XPTInterfaceInfoManager::GetNameForIID(const nsIID * iid, char **_retval)
-{
-    NS_ASSERTION(iid, "bad param");
-    NS_ASSERTION(_retval, "bad param");
-
-    ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
-    xptiInterfaceEntry* entry = mWorkingSet.mIIDTable.Get(*iid);
-    if (!entry) {
-        *_retval = nullptr;
-        return NS_ERROR_FAILURE;
-    }
-
-    return entry->GetName(_retval);
-}
-
 void
 XPTInterfaceInfoManager::GetScriptableInterfaces(nsCOMArray<nsIInterfaceInfo>& aInterfaces)
 {
     // I didn't want to incur the size overhead of using nsHashtable just to
     // make building an enumerator easier. So, this code makes a snapshot of
     // the table using an nsISupportsArray and builds an enumerator for that.
     // We can afford this transient cost.
 
@@ -266,39 +234,8 @@ XPTInterfaceInfoManager::GetScriptableIn
     for (auto iter = mWorkingSet.mNameTable.Iter(); !iter.Done(); iter.Next()) {
         xptiInterfaceEntry* entry = iter.UserData();
         if (entry->GetScriptableFlag()) {
             nsCOMPtr<nsIInterfaceInfo> ii = entry->InterfaceInfo();
             aInterfaces.AppendElement(ii);
         }
     }
 }
-
-NS_IMETHODIMP
-XPTInterfaceInfoManager::EnumerateInterfacesWhoseNamesStartWith(const char *prefix, nsIEnumerator **_retval)
-{
-    nsCOMPtr<nsISupportsArray> array;
-    nsresult rv = NS_NewISupportsArray(getter_AddRefs(array));
-    if (NS_FAILED(rv)) {
-        return rv;
-    }
-
-    ReentrantMonitorAutoEnter monitor(mWorkingSet.mTableReentrantMonitor);
-    uint32_t length = static_cast<uint32_t>(strlen(prefix));
-    for (auto iter = mWorkingSet.mNameTable.Iter(); !iter.Done(); iter.Next()) {
-        xptiInterfaceEntry* entry = iter.UserData();
-        const char* name = entry->GetTheName();
-        if (name != PL_strnstr(name, prefix, length)) {
-            continue;
-        }
-        nsCOMPtr<nsIInterfaceInfo> ii;
-        if (NS_SUCCEEDED(EntryToInfo(entry, getter_AddRefs(ii)))) {
-            array->AppendElement(ii);
-        }
-    }
-    return array->Enumerate(_retval);
-}
-
-NS_IMETHODIMP
-XPTInterfaceInfoManager::AutoRegisterInterfaces()
-{
-    return NS_ERROR_NOT_IMPLEMENTED;
-}