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We are removing external uses of ArrayBufferContents::DataHandle so that
eventually we can remove the whole class and change the
implementation of WTF::ArrayBuffers. This CL is an intermediate step on
the way which replaces the external use of DataHandle to make a later
refactoring of ArrayBufferContents easier.

Bug: chromium:1008840
Change-Id: I9bcdee83e26eeccc7a8028c0bf3dd8fe9a455692
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868993Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708162}