Remove GpuMemoryBufferManager and all related methods from
blink::Platform and all its implementations as no clients are now using
it after being converted to use Mappable Shared Image.
Bug: 404887301
Change-Id: I52b50b30318362002eeca88c78f372fcb115d0ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6403464
Commit-Queue: vikas soni <vikassoni@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1439105}
92e8f8d3c9