command_buffer: Remove dead code for gl_begin_gl_end_on_fbo_change_to_backbuffer workaround

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 4823 matching lines @@
 // Added specifically for testing backbuffer_needs_clear_bits unittests.
 uint32_t GLES2DecoderImpl::GetAndClearBackbufferClearBitsForTest() {
   uint32_t clear_bits = backbuffer_needs_clear_bits_;
   backbuffer_needs_clear_bits_ = 0;
   return clear_bits;
 }
 
 void GLES2DecoderImpl::OnFboChanged() const {
   if (workarounds().restore_scissor_on_fbo_change)
     state_.fbo_binding_for_scissor_workaround_dirty = true;
-
-  if (workarounds().gl_begin_gl_end_on_fbo_change_to_backbuffer) {
-    GLint bound_fbo_unsigned = -1;
-    glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &bound_fbo_unsigned);
-    GLuint bound_fbo = static_cast<GLuint>(bound_fbo_unsigned);
-    if (surface_ && surface_->GetBackingFrameBufferObject() == bound_fbo)
-      surface_->NotifyWasBound();
-  }
 }
 
 // Called after the FBO is checked for completeness.
 void GLES2DecoderImpl::OnUseFramebuffer() const {
   if (state_.fbo_binding_for_scissor_workaround_dirty) {
     state_.fbo_binding_for_scissor_workaround_dirty = false;
     // The driver forgets the correct scissor when modifying the FBO binding.
     glScissor(state_.scissor_x,
               state_.scissor_y,
               state_.scissor_width,
@@ skipping 11495 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu