Revert of Mojo multiple command buffer support and sample

mojo/services/gles2/command_buffer_impl.h

Index: mojo/services/gles2/command_buffer_impl.h
diff --git a/mojo/services/gles2/command_buffer_impl.h b/mojo/services/gles2/command_buffer_impl.h
index d6b5bd8ce99a026325cee93fa1a71153ed527b37..fc90d348aa9ef6b36f9d8e3a91d9b26368fb296e 100644
--- a/mojo/services/gles2/command_buffer_impl.h
+++ b/mojo/services/gles2/command_buffer_impl.h
@@ -18,13 +18,10 @@
 class GpuControlService;
 namespace gles2 {
 class GLES2Decoder;
-class MailboxManager;
 }
 }
 
 namespace gfx {
-class GLContext;
-class GLShareGroup;
 class GLSurface;
 }
 
@@ -32,14 +29,8 @@
 
 class CommandBufferImpl : public InterfaceImpl<CommandBuffer> {
  public:
-  // Offscreen.
-  CommandBufferImpl(gfx::GLShareGroup* share_group,
-                    gpu::gles2::MailboxManager* mailbox_manager);
-  // Onscreen.
   CommandBufferImpl(gfx::AcceleratedWidget widget,
-                    const gfx::Size& size,
-                    gfx::GLShareGroup* share_group,
-                    gpu::gles2::MailboxManager* mailbox_manager);
+                    const gfx::Size& size);
   virtual ~CommandBufferImpl();
 
   virtual void Initialize(CommandBufferSyncClientPtr sync_client,
@@ -68,10 +59,7 @@
   scoped_ptr<gpu::CommandBufferService> command_buffer_;
   scoped_ptr<gpu::gles2::GLES2Decoder> decoder_;
   scoped_ptr<gpu::GpuScheduler> scheduler_;
-  scoped_refptr<gfx::GLContext> context_;
   scoped_refptr<gfx::GLSurface> surface_;
-  scoped_refptr<gfx::GLShareGroup> share_group_;
-  scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(CommandBufferImpl);
 };