Revert "[webgl] Make WebGLObject the owner of the object's ID"

This reverts commit de41806ec1b526f30034f342490eca9746fea096.

Reason for revert: This CL introduced a DCHECK in
blink::WebGLObject::SetObject that is consistently triggered
on bots and causes tests to time out because their test pages
die.

Bug: 413078308
Fixed: 414129877
Original change's description:
> [webgl] Make WebGLObject the owner of the object's ID
>
> Logic to get, set and check the GLuint ID of the WebGL object was
> duplicated between WebGLSharedPlatform3DObject and the non-shareable
> object, leading to some complexity and additional virtual calls. Merge
> all the logic in WebGLObject. This will make it easier to work with
> WebGL[Context/Shared/Shared3DPlatform]Object in future CLs.
>
> Also move IsRenderbuffer/Texture on WebGLObject and remove other unused
> RTTI virtual methods.
>
> Bug: 413078308
> Change-Id: Ie9fbd263b9958007caec0ba744ed300bf3407157
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6485690
> Reviewed-by: Brandon Jones <bajones@chromium.org>
> Commit-Queue: Corentin Wallez <cwallez@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1451655}

Bug: 413078308
Change-Id: Iddf1a6c18d721f8ae0750d455376b660afad68f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6494586
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Friedrich Hauser <friedrichh@chromium.org>
Owners-Override: Friedrich Hauser <friedrichh@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1452517}