command_buffer: Remove dead code for gl_begin_gl_end_on_fbo_change_to_backbuffer workaround

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index c9e8470b6cca2e031b61a22bbd12e737b48a5c55..ea217d191e1d3e0434de52bf11ec6c576af5f7ef 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -4841,14 +4841,6 @@ uint32_t GLES2DecoderImpl::GetAndClearBackbufferClearBitsForTest() {
 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.