Don't initialize decryptor on CDM creation failure

content/renderer/media/crypto/ppapi_decryptor.cc

 // Copyright 2013 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 "content/renderer/media/crypto/ppapi_decryptor.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 26 matching lines @@
     const media::CdmCreatedCB& cdm_created_cb) {
   std::string plugin_type = media::GetPepperType(key_system);
   DCHECK(!plugin_type.empty());
   scoped_ptr<PepperCdmWrapper> pepper_cdm_wrapper =
       create_pepper_cdm_cb.Run(plugin_type, security_origin);
   if (!pepper_cdm_wrapper) {
     DLOG(ERROR) << "Plugin instance creation failed.";
     base::MessageLoopProxy::current()->PostTask(
         FROM_HERE, base::Bind(cdm_created_cb, nullptr,
                               "Plugin instance creation failed."));
+    return;
   }
 
   scoped_ptr<PpapiDecryptor> ppapi_decryptor(
       new PpapiDecryptor(pepper_cdm_wrapper.Pass(), session_message_cb,
                          session_closed_cb, legacy_session_error_cb,
                          session_keys_change_cb, session_expiration_update_cb));
 
   // PpapiDecryptor ownership passed to the promise, but keep a copy in order
   // to call InitializeCdm().
   PpapiDecryptor* ppapi_decryptor_copy = ppapi_decryptor.get();
@@ skipping 400 matching lines @@
   DCHECK(render_loop_proxy_->BelongsToCurrentThread());
   pepper_cdm_wrapper_.reset();
 }
 
 ContentDecryptorDelegate* PpapiDecryptor::CdmDelegate() {
   DCHECK(render_loop_proxy_->BelongsToCurrentThread());
   return (pepper_cdm_wrapper_) ? pepper_cdm_wrapper_->GetCdmDelegate() : NULL;
 }
 
 }  // namespace content