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

cc/layers/texture_layer.h

 // Copyright 2010 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.
 
 #ifndef CC_LAYERS_TEXTURE_LAYER_H_
 #define CC_LAYERS_TEXTURE_LAYER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 76 matching lines @@
   TextureLayer(TextureLayerClient* client, bool uses_mailbox);
   virtual ~TextureLayer();
 
  private:
   class MailboxHolder : public base::RefCountedThreadSafe<MailboxHolder> {
    public:
     class MainThreadReference {
      public:
       explicit MainThreadReference(MailboxHolder* holder);
       ~MainThreadReference();
-      MailboxHolder* holder() { return holder_; }
+      MailboxHolder* holder() { return holder_.get(); }
 
      private:
       scoped_refptr<MailboxHolder> holder_;
       DISALLOW_COPY_AND_ASSIGN(MainThreadReference);
     };
 
     static scoped_ptr<MainThreadReference> Create(
         const TextureMailbox& mailbox);
 
     const TextureMailbox& mailbox() const { return mailbox_; }
@@ skipping 39 matching lines @@
 
   unsigned texture_id_;
   scoped_ptr<MailboxHolder::MainThreadReference> holder_ref_;
   bool needs_set_mailbox_;
 
   DISALLOW_COPY_AND_ASSIGN(TextureLayer);
 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_TEXTURE_LAYER_H_