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The OnionSoup effort has a goal of allocating all garbage-collectible Blink objects
with Oilpan or PartitionAlloc. However, some classes of
//blink/renderer/modules/webaudio have not yet been allocated with them so far.
So their uses of non-garbage-collected objects should be restricted to cases where
the garbage collector can discover their references. The macros of Allocator will be
useful for the non-garbage-collected objects to avoid unintended allocations.

After some analyzes, it was concluded that for the case of ProcessorCreationParams and
SharedAudioBuffer classes, they make sense to use USING_FAST_MALLOC because they have
been used as member variables with smart pointers.

Bug: 919389
Change-Id: I415dc3360abcadff5d2b3ce25035d09d674c2720
Reviewed-on: https://chromium-review.googlesource.com/c/1488399Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#635491}