Revert "Add memory alignment parameter to gpu::Buffer"

This reverts commit 2b034ff051.

Reason for revert: broke MSAN bots. See https://crbug.com/1434472

Original change's description:
> Add memory alignment parameter to gpu::Buffer
>
> Bug: 1426766
> Change-Id: I0902bf42975ca0a1bb967208fa51e42f4a74392e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4377798
> Commit-Queue: Sergey Pashaev <bioh@yandex-team.ru>
> Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1131990}

Bug: 1426766
Change-Id: I80d49b1f5712cd50e63f041feac79e9415349aad
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4443370
Reviewed-by: Meredith Lane <meredithl@chromium.org>
Auto-Submit: Austin Sullivan <asully@chromium.org>
Owners-Override: Austin Sullivan <asully@chromium.org>
Commit-Queue: Meredith Lane <meredithl@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1132321}

ppapi/proxy/ppapi_command_buffer_proxy.cc

@@ -119,7 +119,6 @@ void PpapiCommandBufferProxy::SetGetBuffer(int32_t transfer_buffer_id) {
 scoped_refptr<gpu::Buffer> PpapiCommandBufferProxy::CreateTransferBuffer(
     uint32_t size,
     int32_t* id,
-    uint32_t alignment,
     gpu::TransferBufferAllocationOption option) {
   *id = -1;
 

ppapi/proxy/ppapi_command_buffer_proxy.h

@@ -55,7 +55,6 @@ class PPAPI_PROXY_EXPORT PpapiCommandBufferProxy : public gpu::CommandBuffer,
   scoped_refptr<gpu::Buffer> CreateTransferBuffer(
       uint32_t size,
       int32_t* id,
-      uint32_t alignment = 0,
       gpu::TransferBufferAllocationOption option =
           gpu::TransferBufferAllocationOption::kLoseContextOnOOM) override;
   void DestroyTransferBuffer(int32_t id) override;