remove linked_ptr from gpu/

gpu/command_buffer/service/common_decoder.h

Index: gpu/command_buffer/service/common_decoder.h
diff --git a/gpu/command_buffer/service/common_decoder.h b/gpu/command_buffer/service/common_decoder.h
index e280cea2dad2ab6d475d2727c44ce3f67d33968b..a947286f72a391e50b75b3cb469cffa80b92074f 100644
--- a/gpu/command_buffer/service/common_decoder.h
+++ b/gpu/command_buffer/service/common_decoder.h
@@ -10,11 +10,9 @@
 
 #include <map>
 #include <memory>
-#include <stack>
 #include <string>
 
 #include "base/macros.h"
-#include "base/memory/linked_ptr.h"
 #include "gpu/command_buffer/common/buffer.h"
 #include "gpu/command_buffer/service/cmd_parser.h"
 #include "gpu/gpu_export.h"
@@ -198,7 +196,7 @@ class GPU_EXPORT CommonDecoder : NON_EXPORTED_BASE(public AsyncAPIInterface) {
   CommandBufferEngine* engine_;
   size_t max_bucket_size_;
 
-  typedef std::map<uint32_t, linked_ptr<Bucket>> BucketMap;
+  typedef std::map<uint32_t, std::unique_ptr<Bucket>> BucketMap;
   BucketMap buckets_;
 
   typedef Error (CommonDecoder::*CmdHandler)(uint32_t immediate_data_size,
@@ -215,6 +213,7 @@ class GPU_EXPORT CommonDecoder : NON_EXPORTED_BASE(public AsyncAPIInterface) {
   // A table of CommandInfo for all the commands.
   static const CommandInfo command_info[];
 
+  DISALLOW_COPY_AND_ASSIGN(CommonDecoder);
 };
 
 }  // namespace gpu