PPAPI: Make GLES2 calls resilient to bad/dead resources.

ppapi/proxy/ppb_graphics_3d_proxy.h

Index: ppapi/proxy/ppb_graphics_3d_proxy.h
diff --git a/ppapi/proxy/ppb_graphics_3d_proxy.h b/ppapi/proxy/ppb_graphics_3d_proxy.h
index 8f6b40fbfc491e6b0a45544a6702a4639e1f89d2..18ba9dd5e3c54fd9c121ed585e501b0400ec1e10 100644
--- a/ppapi/proxy/ppb_graphics_3d_proxy.h
+++ b/ppapi/proxy/ppb_graphics_3d_proxy.h
@@ -49,18 +49,12 @@ class Graphics3D : public PPB_Graphics3D_Shared {
   virtual uint32_t InsertSyncPoint() OVERRIDE;
 
  private:
-  class LockingCommandBuffer;
-
   // PPB_Graphics3D_Shared overrides.
   virtual gpu::CommandBuffer* GetCommandBuffer() OVERRIDE;
   virtual gpu::GpuControl* GetGpuControl() OVERRIDE;
   virtual int32 DoSwapBuffers() OVERRIDE;
-  virtual void PushAlreadyLocked() OVERRIDE;
-  virtual void PopAlreadyLocked() OVERRIDE;
 
-  int num_already_locked_calls_;
   scoped_ptr<PpapiCommandBufferProxy> command_buffer_;
-  scoped_ptr<LockingCommandBuffer> locking_command_buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(Graphics3D);
 };