ServiceWorker: Change base URL for parsing script URL and scope URL

[chromium-wpt-export-bot]

According to the spec change, this changes to use the relevant settings object
instead of the entry settings object to parse the script URL and the scope URL
given to ServiceWorkerContainer.register() and
ServiceWorkerContainer.getRegistration().

Before this CL, register() and getRegistration() used entered execution context
to parse the URLs. After this CL, the methods use the execution context
retrieved from ScriptState::getExecutionContext().

WPT: external/wpt/service-workers/service-worker/multi-globals/url-parsing.https.html

Spec issue: w3c/ServiceWorker#922
Spec change: w3c/ServiceWorker@ec1aac2

BUG=691008

Review-Url: https://codereview.chromium.org/2691903005
Cr-Commit-Position: refs/heads/master@{#453033}

[wpt-pr-bot]

Notifying @ehsan and @mkruisselbrink. (Learn how reviewing works.)

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View the complete job log.

Firefox (nightly channel)

Testing web-platform-tests at revision 033224ad656db2304f20c376dc7b96c601276c73
Using browser at version BuildID 20170224110129; SourceStamp be661bae6cb9a53935c5b87744bf68879d9ebcc5
Starting 10 test iterations
All results were stable

All results

3 tests ran

/service-workers/service-worker/multiple-register.https.html

Subtest	Results
	OK
Subsequent registrations resolve to the same registration object	PASS
Concurrent registrations resolve to the same registration object	PASS
Subsequent registrations from a different iframe resolve to the different registration object but they refer to the same registration and workers	FAIL

/service-workers/service-worker/controller-on-reload.https.html

Subtest	Results
	OK
controller is set upon reload after registration	FAIL

/service-workers/service-worker/registration-iframe.https.html

Subtest	Results
	OK
register method should use the "relevant global object" to parse its scriptURL and scope - normal case	FAIL
A scope url should start with the given script url	FAIL
register method should use the "relevant global object" to parse its scriptURL and scope - error case	FAIL

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View the complete job log.

Chrome (unstable channel)

Testing web-platform-tests at revision 033224ad656db2304f20c376dc7b96c601276c73
Using browser at version 58.0.3018.3 dev
Starting 10 test iterations
All results were stable

All results

3 tests ran

/service-workers/service-worker/multiple-register.https.html

Subtest	Results
	OK
Subsequent registrations resolve to the same registration object	PASS
Concurrent registrations resolve to the same registration object	PASS
Subsequent registrations from a different iframe resolve to the different registration object but they refer to the same registration and workers	FAIL

/service-workers/service-worker/controller-on-reload.https.html

Subtest	Results
	OK
controller is set upon reload after registration	FAIL

/service-workers/service-worker/registration-iframe.https.html

Subtest	Results
	OK
register method should use the "relevant global object" to parse its scriptURL and scope - normal case	FAIL
A scope url should start with the given script url	FAIL
register method should use the "relevant global object" to parse its scriptURL and scope - error case	FAIL