Report the content type for wasm modules in hosted mode
Report the content type for wasm modules in hosted mode

In the hosted_mode server, set the appropriate content type when serving
wasm modules.

Change-Id: I9ce8ed32804b0b0afe0a2110faedae6ce51f4478
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2035795
Reviewed-by: Paul Lewis <8915f5d5c39a08c5a3e8a8d7314756e4580816f9@chromium.org>
Commit-Queue: Philip Pfaffe <639a645feae3653b7aaefa0387217d375f2f82ff@chromium.org>

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