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Previously, when an exception is thrown,
ModulatorImplBase::ExecuteModule() returns
ModuleEvaluationResult::Empty(),
when CaptureEvalErrorFlag::kReport is used and
top-level await is not enabled.
This is considered as success, but this is inconsistent with

- ModuleRecord::Evaluate() that returns
  ModuleEvaluationResult::FromException()
  (that is considered as non-success), and
- Classic script evaluation.

This CL makes ModulatorImplBase::ExecuteModule() return
ModuleEvaluationResult with an exception in such cases.

Behavior change:
This changes WorkerReportingProxy::DidEvaluateTopLevelScript()'s
|is_success| value from true to false when a module script
have parse/evaluation/etc. errors.
This makes serviceworker registration fails for such scripts,
fixing crbug.com/1129795.

This CL fixes content/test/data/service_worker/worker.js
to use `globalThis` instead of `this`, because on module scripts
`this` can't be used to get the global object.
(Previously, the test using this script
ServiceWorkerVersionBrowserTest.StartInstalledModuleScriptWhileOffline
unexpectedly threw an exception during evaluation of `worker.js`
as a module service worker top-level script, but didn't fail
due to this issue)

Bug: 1129795, 1129743, 1111134
Change-Id: I5443539c201e1ab220fd17f9291b307432853450
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419054
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Dominic Farolino <dom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810141}