Update ppapi/ to use scoped_refptr<T>::get() rather than implicit "operator T*"

ppapi/proxy/ppb_instance_proxy.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 "ppapi/proxy/ppb_instance_proxy.h"
 
 #include "base/memory/ref_counted.h"
 #include "build/build_config.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/pp_time.h"
@@ skipping 393 matching lines @@
     case FLASH_CLIPBOARD_SINGLETON_ID:
     case FLASH_FILE_SINGLETON_ID:
     case FLASH_FULLSCREEN_SINGLETON_ID:
     case FLASH_SINGLETON_ID:
     case PDF_SINGLETON_ID:
       NOTREACHED();
       break;
 #endif  // !defined(OS_NACL) && !defined(NACL_WIN64)
   }
 
-  if (!new_singleton) {
+  if (!new_singleton.get()) {
     // Getting here implies that a constructor is missing in the above switch.
     NOTREACHED();
     return NULL;
   }
 
   data->singleton_resources[id] = new_singleton;
   return new_singleton.get();
 }
 
 int32_t PPB_Instance_Proxy::RequestInputEvents(PP_Instance instance,
@@ skipping 829 matching lines @@
     PP_Instance instance) {
   InstanceData* data = static_cast<PluginDispatcher*>(dispatcher())->
       GetInstanceData(instance);
   if (!data)
     return;  // Instance was probably deleted.
   data->should_do_request_surrounding_text = false;
 }
 
 }  // namespace proxy
 }  // namespace ppapi