Revert of Reland "Added an extra sync token field for extra command buffer..."

gpu/command_buffer/tests/gl_manager.cc

Index: gpu/command_buffer/tests/gl_manager.cc
diff --git a/gpu/command_buffer/tests/gl_manager.cc b/gpu/command_buffer/tests/gl_manager.cc
index d72994be70d24c1565039073b2af229062178425..3053abd8c6aaa4c24c6ca1c2c1b82ecaf907151b 100644
--- a/gpu/command_buffer/tests/gl_manager.cc
+++ b/gpu/command_buffer/tests/gl_manager.cc
@@ -505,10 +505,6 @@
   return command_buffer_id_;
 }
 
-int32_t GLManager::GetExtraCommandBufferData() const {
-  return 0;
-}
-
 uint64_t GLManager::GenerateFenceSyncRelease() {
   return next_fence_sync_release_++;
 }