Rename the shared_impl resource files to give them more regular names.

ppapi/shared_impl/ppb_audio_shared.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/shared_impl/ppb_audio_shared.h"
 
 #include "base/logging.h"
 
 namespace ppapi {
 
@@ skipping 74 matching lines @@
   void* buffer = shared_memory_->memory();
 
   while (sizeof(pending_data) ==
       socket_->Receive(&pending_data, sizeof(pending_data)) &&
       pending_data >= 0) {
     callback_(buffer, shared_memory_size_, user_data_);
   }
 }
 
 }  // namespace ppapi