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

ppapi/proxy/truetype_font_singleton_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/truetype_font_singleton_resource.h"
 
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/serialized_structs.h"
 #include "ppapi/shared_impl/array_writer.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
@@ skipping 31 matching lines @@
   return PP_OK_COMPLETIONPENDING;
 }
 
 int32_t TrueTypeFontSingletonResource::GetFontsInFamily(
       PP_Instance instance,
       PP_Var family,
       const PP_ArrayOutput& output,
       const scoped_refptr<TrackedCallback>& callback) {
   scoped_refptr<StringVar> family_var = StringVar::FromPPVar(family);
   const uint32_t kMaxFamilySizeInBytes = 1024;
-  if (!family_var || family_var->value().size() > kMaxFamilySizeInBytes)
+  if (!family_var.get() || family_var->value().size() > kMaxFamilySizeInBytes)
     return PP_ERROR_BADARGUMENT;
   Call<PpapiPluginMsg_TrueTypeFontSingleton_GetFontsInFamilyReply>(BROWSER,
       PpapiHostMsg_TrueTypeFontSingleton_GetFontsInFamily(family_var->value()),
       base::Bind(
           &TrueTypeFontSingletonResource::OnPluginMsgGetFontsInFamilyComplete,
           this, callback, output));
   return PP_OK_COMPLETIONPENDING;
 }
 
 void TrueTypeFontSingletonResource::OnPluginMsgGetFontFamiliesComplete(
@@ skipping 49 matching lines @@
     }
   } else {
     result = PP_ERROR_FAILED;
   }
 
   callback->Run(result);
 }
 
 }  // namespace proxy
 }  // namespace ppapi