Allow immutable textures into mailboxes

gpu/command_buffer/service/mailbox_manager.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/service/mailbox_manager.h"
 
 #include "base/rand_util.h"
 #include "crypto/hmac.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "gpu/command_buffer/service/texture_definition.h"
@@ skipping 59 matching lines @@
   return true;
 }
 
 void MailboxManager::DestroyOwnedTextures(TextureManager* owner,
                                           bool have_context) {
   TextureDefinitionMap::iterator it = textures_.begin();
   while (it != textures_.end()) {
     TextureDefinitionMap::iterator current_it = it;
     ++it;
     if (current_it->second.owner == owner) {
-      NOTREACHED();
       GLuint service_id = current_it->second.definition->ReleaseServiceId();
       if (have_context)
         glDeleteTextures(1, &service_id);
       textures_.erase(current_it);
     }
   }
 }
 
 void MailboxManager::SignMailboxName(MailboxName* name) {
   bool success = hmac_.Sign(
@@ skipping 26 matching lines @@
     TextureManager* owner)
     : definition(definition),
       owner(owner) {
 }
 
 MailboxManager::OwnedTextureDefinition::~OwnedTextureDefinition() {
 }
 
 }  // namespace gles2
 }  // namespace gpu