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

ppapi/proxy/video_destination_resource.cc

 // Copyright (c) 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 "ppapi/proxy/video_destination_resource.h"
 
 #include "base/bind.h"
 #include "ipc/ipc_message.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/private/pp_video_frame_private.h"
@@ skipping 29 matching lines @@
 int32_t VideoDestinationResource::Open(
     const PP_Var& stream_url,
     scoped_refptr<TrackedCallback> callback) {
   if (TrackedCallback::IsPending(open_callback_))
     return PP_ERROR_INPROGRESS;
 
   open_callback_ = callback;
 
   scoped_refptr<StringVar> stream_url_var = StringVar::FromPPVar(stream_url);
   const uint32_t kMaxStreamIdSizeInBytes = 16384;
-  if (!stream_url_var ||
+  if (!stream_url_var.get() ||
       stream_url_var->value().size() > kMaxStreamIdSizeInBytes)
     return PP_ERROR_BADARGUMENT;
   Call<PpapiPluginMsg_VideoDestination_OpenReply>(RENDERER,
       PpapiHostMsg_VideoDestination_Open(stream_url_var->value()),
       base::Bind(&VideoDestinationResource::OnPluginMsgOpenComplete, this));
   return PP_OK_COMPLETIONPENDING;
 }
 
 int32_t VideoDestinationResource::PutFrame(
     const PP_VideoFrame_Private& frame) {
@@ skipping 32 matching lines @@
   if (TrackedCallback::IsPending(open_callback_)) {
     int32_t result = params.result();
     if (result == PP_OK)
       is_open_ = true;
     open_callback_->Run(result);
   }
 }
 
 }  // namespace proxy
 }  // namespace ppapi