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Reason for revert:
Use of the GPUProgrammablePassEncoder and GPURenderEncoderBase
interfaces aren't installing the function templates properly.

According to the spec[1], the first identifier of `includes` statement
MUST reference a `interface`. It means that a `interface mixin` cannot
include the other `interface mixin`.
In this case, even though GPURenderEncoderBase is `interface mixin`, it
includes GPUProgrammablePassEncoder which is `interface mixin`.

Solution:
The problem should be fixed in spec side[2] and make final interfaces
include the mixins directly as follows:
  GPURenderBundleEncoder includes GPUProgrammablePassEncoder;
  GPURenderPassEncoder includes GPUProgrammablePassEncoder;

Original change's description:
> WebGPU: Add GPUProgrammablePassEncoder interface
>
> This is a spec match-up with[1]
>
> [1] https://github.com/gpuweb/gpuweb/pull/459
>
> Bug: 877147
> Change-Id: I080324cbb083160ae84aa109623e311f24a875cb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845132
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Commit-Queue: Jinho Bang <jinho.bang@samsung.com>
> Cr-Commit-Position: refs/heads/master@{#704061}

[1] https://heycam.github.io/webidl/#includes-statement
[2] https://github.com/gpuweb/gpuweb/pull/470

Bug: 1013649
Change-Id: Iaeb1ac69b0f1f7a779c341e7a92f6b29e28d3880
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1857846
Commit-Queue: Jinho Bang <jinho.bang@samsung.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705991}