unused import: mem, in components/net/image_cache.rs

[Loirooriol]

When compiling I get

warning: unused import: `mem`
 --> components/net/image_cache.rs:9:11
  |
9 | use std::{mem, thread};
  |           ^^^
  |
  = note: `#[warn(unused_imports)]` on by default

#31564 used std::mem::take(own_bytes) instead of mem::take(own_bytes). So it's a matter of either changing the consumer into mem::take(own_bytes), or removing the import of mem.

[servo-highfive]

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