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Modify URLRequestExtensionJob to determine the mime type of a requested
file through net::GetWellKnownMimeTypeFromExtension(), rather than
URLRequestFileJob::GetMimeType(). The difference here is that the latter
will include platform-specific modifications. This means that if another
application on the users machine specified a different mime type for an
extension, that type would be used.

This causes problems with modules in extensions, in the cases where a
different application has set a different mime type for .js files, since
modules have strict mime type requirements.

Use GetWellKnownMimeTypeFromExtension(), and add .js to the list of
primary mappings in mime_util.cc.

Bug: 797712

Change-Id: I27fea0479268520abd08fb62a501d213a3a04f52
Reviewed-on: https://chromium-review.googlesource.com/885401Reviewed-by: Asanka Herath <asanka@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532070}