GitLab

With this CL the ArrayBuffer class gets finally removed and completely
merged into DOMArrayBufferBase. This required the following changes:

* Move the internal fields of ArrayBuffer to DOMArrayBufferBase:
  array_buffer_contents_ and is_detached_.
* Change DOMArrayBufferBase to be based on ArrayBufferContents instead of
  ArrayBuffer now.
* Change the constructors of DOMArrayBuffer and SharedDOMArrayBuffer.
* Move the implementation of ArrayBuffer::Transfer to DOMArrayBuffer.
* Make ArrayBufferContents copyable. As ArrayBufferContents is just a
  wrapper around an std::shared_ptr, this is fine.
* Add a Detach function to DOMArrayBufferBase which allows to set the
  is_detached_ flag.

R=haraken@chromium.org, ulan@chromium.org

Bug: chromium:1008840
Change-Id: I2355ce0a38cf0453af2960b03e7a984dc002d1c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2106058Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750945}