content: Cleanup GpuMemoryBufferImpl destruction.

content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.h

Index: content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.h
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.h b/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.h
index 792d0997b5028b3dc7074b16898cff4071ef150b..0f96da2d533802ff64d771e9f465913907a3c907 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.h
+++ b/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.h
@@ -13,7 +13,8 @@ namespace content {
 class GpuMemoryBufferImplSharedMemory : public GpuMemoryBufferImpl {
  public:
   GpuMemoryBufferImplSharedMemory(const gfx::Size& size,
-                                  unsigned internalformat);
+                                  unsigned internalformat,
+                                  const DestructionCallback& callback);
   virtual ~GpuMemoryBufferImplSharedMemory();
 
   static void Create(const gfx::Size& size,
@@ -45,6 +46,7 @@ class GpuMemoryBufferImplSharedMemory : public GpuMemoryBufferImpl {
   virtual gfx::GpuMemoryBufferHandle GetHandle() const OVERRIDE;
 
  private:
+  const DestructionCallback callback_;
   scoped_ptr<base::SharedMemory> shared_memory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImplSharedMemory);