Revert "projector: fix `RunPaths` result aliasing (#4479)" (#4506)
Revert "projector: fix `RunPaths` result aliasing (#4479)" (#4506)

Summary:
Some Google-internal, non-TensorBoard code depends on the projector and
monkey patches out its internals in a way that is not compatible with
the changes in #4479. This is clearly not ideal and should probably be
fixed downstream, but pending investigation we revert #4479 to unbreak.

This reverts commit 638014e1c12e43aeb090e8b101e0cf41c518c650.

Test Plan:
Test sync at this tree passes all tests.

wchargin-branch: projector-revert-4479

tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard