This incorporates recent feedback:
- simpler deserialization API by dropping the std::unique_ptr.
The only purpose there was communicating to the caller that they
own the buffer, and that the deserializer won't delete it. The new
design communicates that through a naming choice.
- renamed *UncompiledBytes to *WasmWireBytes

BUG=

Review-Url: https://codereview.chromium.org/2411263004
Cr-Commit-Position: refs/heads/master@{#40238}