content: Cleanup GpuMemoryBufferImpl destruction.

content/common/gpu/client/gpu_memory_buffer_impl.cc

 // Copyright 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 "content/common/gpu/client/gpu_memory_buffer_impl.h"
 
 #include "ui/gl/gl_bindings.h"
 
 namespace content {
 
 GpuMemoryBufferImpl::GpuMemoryBufferImpl(const gfx::Size& size,
-                                         unsigned internalformat)
-    : size_(size), internalformat_(internalformat), mapped_(false) {
+                                         unsigned internalformat,
+                                         const DestructionCallback& callback)
+    : size_(size),
+      internalformat_(internalformat),
+      callback_(callback),
+      mapped_(false) {
   DCHECK(IsFormatValid(internalformat));
 }
 
-GpuMemoryBufferImpl::~GpuMemoryBufferImpl() {}
+GpuMemoryBufferImpl::~GpuMemoryBufferImpl() {
+  callback_.Run();
+}
 
 // static
 bool GpuMemoryBufferImpl::IsFormatValid(unsigned internalformat) {
   switch (internalformat) {
     case GL_BGRA8_EXT:
     case GL_RGBA8_OES:
       return true;
     default:
       return false;
   }
@@ skipping 18 matching lines @@
       return 4;
     default:
       NOTREACHED();
       return 0;
   }
 }
 
 bool GpuMemoryBufferImpl::IsMapped() const { return mapped_; }
 
 }  // namespace content