BlinkMemoryMgt: Apply USING_FAST_MALLOC to MemoryUsageMonitor

Though none garbage-collectable Blink objects should be allocated by
PartitionAlloc, MemoryUsageMonitor has not allocated by the PartitionAlloc
so far. This CL adds USING_FAST_MALLOC to the classes to make them to allocate
the memory from the FastMalloc partition of PartitionAlloc.

Bug: 919389
Change-Id: Ibf64f582f2c567189f96cc49e6957e34a5ef452b
Reviewed-on: https://chromium-review.googlesource.com/c/1469756
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#632065}
1 file changed