During image destroy, delete textures only if we have a GL context.

ui/gl/gl_image_shared_memory.h

 // Copyright 2014 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 UI_GL_GL_IMAGE_SHARED_MEMORY_H_
 #define UI_GL_GL_IMAGE_SHARED_MEMORY_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/gl/gl_image_memory.h"
 
 namespace gfx {
 
 class GL_EXPORT GLImageSharedMemory : public GLImageMemory {
  public:
   GLImageSharedMemory(const gfx::Size& size, unsigned internalformat);
 
   bool Initialize(const gfx::GpuMemoryBufferHandle& handle);
 
   // Overridden from GLImage:
-  virtual void Destroy() OVERRIDE;
+  virtual void Destroy(bool have_context) OVERRIDE;
 
  protected:
   virtual ~GLImageSharedMemory();
 
  private:
   scoped_ptr<base::SharedMemory> shared_memory_;
 
   DISALLOW_COPY_AND_ASSIGN(GLImageSharedMemory);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_IMAGE_SHARED_MEMORY_H_