Revert of gpu: Add CHROMIUM_sync_query extension.

gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h

Index: gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h
diff --git a/gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h b/gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h
index d296018a0da3820510cb02295acc9750c955271d..ca49ced6f810c91238fd57d51620e13cd4727fc3 100644
--- a/gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h
+++ b/gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h
@@ -214,8 +214,7 @@
     GL_COMMANDS_ISSUED_CHROMIUM,
     GL_LATENCY_QUERY_CHROMIUM,
     GL_ASYNC_PIXEL_UNPACK_COMPLETED_CHROMIUM,
-    GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM,
-    GL_COMMANDS_COMPLETED_CHROMIUM, };
+    GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM, };
 
 static const GLenum valid_read_pixel_format_table[] = {GL_ALPHA, GL_RGB,
                                                        GL_RGBA, };