Remove assertion on instance destruction.

ppapi/cpp/instance.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/cpp/instance.h"
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_input_event.h"
 #include "ppapi/c/ppb_instance.h"
 #include "ppapi/c/ppb_messaging.h"
@@ skipping 24 matching lines @@
 template <> const char* interface_name<PPB_Messaging>() {
   return PPB_MESSAGING_INTERFACE;
 }
 
 }  // namespace
 
 Instance::Instance(PP_Instance instance) : pp_instance_(instance) {
 }
 
 Instance::~Instance() {
-  // Ensure that all per-instance objects have been removed. Generally, these
-  // objects should have their lifetime scoped to the instance, such as being
-  // instance members or even implemented by your instance sub-class directly.
-  //
-  // If they're not unregistered at this point, they will usually have a
-  // dangling reference to the instance, which can cause a crash later.
-  PP_DCHECK(interface_name_to_objects_.empty());
 }
 
 bool Instance::Init(uint32_t /*argc*/, const char* /*argn*/[],
                     const char* /*argv*/[]) {
   return true;
 }
 
 void Instance::DidChangeView(const View& view) {
   // Call the deprecated version for source backwards-compat.
   DidChangeView(view.GetRect(), view.GetClipRect());
@@ skipping 112 matching lines @@
   if (!that)
     return NULL;
   InterfaceNameToObjectMap::iterator found =
       that->interface_name_to_objects_.find(interface_name);
   if (found == that->interface_name_to_objects_.end())
     return NULL;
   return found->second;
 }
 
 }  // namespace pp